1 DIMENSIONAL, ENVIRONMENTAL AND POWER SUPPLY SPECIFICATIONS

1.1 DIMENSIONAL

Nominal Dimensions 
137mmH x 248mmW x 284mmD (5.4″ x 9.75″ x 11.2″) with feet not 
Nominal Weight 
extended 3.2kg (71b) net, 5kg (11lb) shipping 
1.2 ENVIRONMENTAL

Storage Environment 
20 to 75C (4 to 167F) (noncondensing) 
Operating Environment 
0 to 40C (32 to 104F), <85% RH (noncondensing), Pollution 
Operating Altitude 
Degree 2 0 to 2000m (6560ft) ASL 
1.3 POWER SUPPLY

Line Power 
Installation Category II; 85264Vrms, 45 to 65Hz, 40VA max. Internally fused with a nonuser serviceable fuse 
2 ELECTRICAL CHANNEL INPUT AND ACCURACY SPECIFICATIONS

Note: All percentages are % of reading unless otherwise described. 
2.1 INPUT ISOLATION SPECIFICATIONS

Valid for any V terminal to PXe2640 chassis ground; any A terminal to PXe2640 chassis ground; and between any V and any A terminal. 
Impedance 
>1GΩ II <30pF 
Max. Voltage 
4500VP< max without damage
2500V”MS max for <1s without damage
1OOOV”MS max continuous rated working voltage (CAT I/
II) 600VRMs max continuous rated working voltage (CAT
Ill) 300VRMs max continuous rated working voltage (CAT
IV) 
2.2 VOLTAGE MEASUR EMENT SPECIFICATIONS

The specifications for voltage are independent of the current input option installed in the respective channel. 
2.2.1 VOLTAGE INPUT CAPABILITY AND CHARACTERISTICS

Specification 
S Channel Type 
A Channel Type 
L Channel Type 
W Channel Type 
No Damage Voltage Range 
<1ms 
<100ms 
<5S 
Continuous 
XT2640 

<3000V_{RMS} and V_{PK} 
<500V_{RMS} and 3000V_{PK} 
<3000V_{RMS} and V_{PK} 
<2000V_{RMS} 
<300V_{RMS} 
<1500V_{RMS} 
<1500V_{RMS} 
<250V_{RMS} 
<1000V_{RMS} 
<1000V_{RMS} 
<160V_{RMS} 
<650V_{RMS} 
As above 
Measurable Voltacie Rancie 
Unpowered 

<1803V_{RMS} and V_{PK} 
<182.3V_{RMS} and V_{PK} 
<1803_{RMS} and V_{PK} 
Specified Voltacie Rancie 
<1OOOV_{RMS} and <1750V_{PK} 
<160V_{RMS} and <175V_{PK} 
<65OV_{RMS} and <1750V_{PK} 
Impedance Burden 
1.201MΩ ± 0.25% 
121kΩ ± 0.25% 
399.5kΩ ± 0.25% 
3dB Bandwidth(typical) 
900kHz 
3MHz 

2.2.2 VOLTAGE MEASUREMENT ACCURACY

The charts below show guaranteed maximum voltage errors for DC, MAINS, AV IONICS, and 50kHz throughout a 1V to 1000V range of applied voltages expressed as % of reading and are va lid within ±5C of the ca libration temperature (add 0.005% per C beyond this) and where no significant commonmode is present. Following the charts is a table which can be used to calculate the guaranteed accuracies for applications other than shown in the charts and also for the computation of numerical errors. 
2.2.2.1 PRIMARY VOLTAGE MEASUREMENT ACCURACY TABLE

Add relevant errors from the table below for the maximum error in primary voltage measurements (e.g. DC, AC, AC +DC, Rectified, Peak, Valley, PeakValley). 
MAXIMUM SCALING ERRORS
Apply to all results as shown below as a percentage of the reading
If signal contains significant levels at multiple frequencies , apply to each level & frequency 
Specification 
S Channel Type 
A Channel Type 
L Channel Type 
W Channel Type 
Base Scaling Error
Apply to all results 
0.1% 
0.03% 
0.1%
(0.2 % if 2ms LF/PERIOD) 
Frequency Dependent Scaling Error
Apply to all results other than DC or MAINS 
AVIONICS 
LF or VLF 
<10kHz 
10k40kHz 
40k100kHz 
100k1MHz 
>1MHz 

None 
0.005% 
None 
0.01% 
0.05% 
F*0.005% 
F*0.002% 
0.05%+(F10)*0.012% 
0.41 %+1F40\*0.025 % 
0.08 %+1F40\*0.004 % 
Typically (F/1000)2*100% 
0.32 %+(F100)*0.013% 
Not specified 
Typically (F/3500)2*100% 
SelfHeating Scaling Error
Apply to all results (only significant at higher voltaaesl 1 minute nominal time constant 
0.05%*(V_{AC+DC}/ 1000)^{2} 
0.5 %*(V_{AC+DC}/1000)^{2} 
0.15 %*(V_{AC+DC}/1000)^{2} 
Temperature Scaling Error
Apply to all results if outside of ±5C from calibration temperature 
0.005% per C outside of ±5C from calibration temperature 
Bandwidth Limit Scaling Error Apply if usina USER bandwidth settina 
10%*(F/F_{BW})^{2}, unspecified for F > 0.3*F_{BW} 
MAXIMUM FLOOR ERRORS
Apply to all results as shown below in Volts (generally only significant at low input 
Specification 
S Channel Type 
A Channel Type 
L Channel Type 
W Channel Type 
Base Floor Error
Apply to all results 
1.8mV 
450µV 
45µV 
1.8mV 
DC Floor Error
Apply to DC and RECTIFIED results
Apply to AC+DC results after multiplying by V_{DC}/V_{AC+DC} 
3mV 
1mV 
100µV 
5mV 
AC Floor Error
Apply to AC, AC+DC, and RECTIFIED results 
MAINS. LF. VLF & F_{BW}<10kHz 
AVIONICS & F_{BW}<50kHz 
Otherwise 

100µV/V_{RDG} 
100µV/V_{RDG} 
4µV/V_{RDG} 
200µV/V_{RDG} 
300µV/V_{RDG} 
300µV/V_{RDG} 
8µV/V_{RDG} 
650µV/V_{RDG} 
1.1mV/V_{RDG} 
1.1mV/V_{RDG} 
11µV/V_{RDG} 
1.5mV/V_{RDG} 
Peak Floor Error
Apply to PK, VLY and PKVLY results 
MAINS. LF. VLF & F_{BW}<10kHz 
AVIONICS & F_{BW}<50kHz 
Otherwise 

40mV 
40mV 
8mV 
60mV 
75mV 
75mV 
11mV 
125mV 
125mV 
125mV 
17mV 
175mV 
Common Mode Error
Apply to AC, AC+DC, and RECTIFIED results Apply using voltage on V LO terminal relative to chassis ground. Error has 90′ phase shift to commonmode voltage 
1µV per V.Hz
(11.5mV@230V/50Hz) 
1OOnV per V.Hz
(1.15mV@230V/50Hz) 
700nV per V.Hz
(8.05mV@230V/50Hz) 
Adjacent Channel Error
Apply to AC, AC+DC, and RECTIFIED results
Apply using adjacent channel A LO or V LO terminal voltage relative to chassis ground. Error has 90′ phase shift to adjacent channel voltage 
300nV per V.Hz
(3.45mV@230V/50Hz) 
30nV per V.Hz
(345µV@230V/50 Hz) 
210nV per V.Hz
(2.415mV@230V/50Hz) 

2.2.2.2 SECONDARY VOLTAGE MEASUREMENT ACCURACY TABLE

Specification 
S Channel Type 
A Channel Type 
L Channel Type 
W Channel Type 
Crest Factor Error 
(Total Floor Error from preceding table for PK results)/V_{AC} 
Form Factor Error 
(fatal Flaar Error from preceding table for AC+DC results)/V_{RECTIFIED} 
InterChannel Error
For 120° between equal amplitudes 
(Relevant Voltage Errors from preceding table at the interchannel voltage) + 0.0015%*F 
Harmonic or Spectrum Error 

<10kHz 
10k115kHz 
115k435kHz 

AC Voltage Errors from preceding table at V and F of the harmonic or spectrum point
+ (H/ N)2*0.3% of reading
+ (if not fundamental) from below using the frequency of the harmonic or spectrum point 
0.01% of V_{AC+DC} 
0.006% of V_{AC+DC} 
0.015% of V_{AC+DC} 
0.05% of V_{AC+DC} 
0.03% of V_{AC+DC} 
Not Available 
0.08% of V_{AC+DC} 
InterChannel Fundamental Phase Error 
0.02°+0.15°*F 
0.01°+0.07°*F 
HarmonicFundamental Phase Error (typical, BANDWIDTH configured as UNFILTERED) 
0.02°+0.1°*F+0.001°*H 
0.02°+0.03°*F+0.001°*H 
%THO Error Errors shown are all expressed in % THD units 

<10kHz 
10k115kHz 
115k435kHz 

(0.005+0.000025*N)*% THD+0.00005*N*✓N
+ from below usina the frequency of highest included harmonic 
0.025+ 1.25/V_{AC} 
0.015+1/V_{AC} 
0.015+0.2/ 
0.03+ 1.5/V_{AC} 
V_{AC} 0.15+3.5/V_{AC} 
0.15 
0.06+ 4/V_{AC} 
+0.35/V_{AC} Not Available 
0.15+4/V_{AC} 

2.3 CURRENT MEASUREMENT SPECIFICATIONS

2.3.1 CURRENT INPUT CAPABILITY AND CHARACTERISTICS

Specification 
Channal Type 
Option H 
Option D HI Range or AutoRange when on HI Range 
Option D LO Range or AutoRange when on LO Range 
Option X HI Range 
Option X LO Range 
No Damage Current Range 
<8ms 
<40ms 
<1s 
Continuous 
XT2640 Unpowered 

All 
<200A_{RMS} and <300A_{PK} 
<150A_{RMS} and <250A_{PK} 
<60A_{RMS} and <150A_{PK} 
<200V_{RMS} and <300V_{PK} 
<20V_{RMS} and <30V_{PK} 
All 
<75A_{RMS} 
<50A_{RMS} 
<40A_{RMS} 
<50V_{RMS} 
<10V_{RMS} 
All 
<50A_{RMS} 
<30A_{RMS} 
<5A_{RMS} 
<30V_{RMS} 
<5V_{RMS} 
All 
<30A_{RMS} 
<20A_{RMS} 
<2A_{RMS} 
<25V_{RMS} and V_{PK} 
<5V_{RMS} and V_{PK} 
All 
As Above 
<2V_{RMS} and <150V_{PK} 
<25V_{RMS} and <300V_{PK} 
Measurable current Range 
All 
<225A_{RMS} and A_{PK} 
<150A_{RMS} and A_{PK} 
<1.02A_{RMS} and A_{PK} 
<23.1V_{RMS} and V_{PK} 
<0.576V_{RMS} and V_{PK} 
Specified Current Range 
All 
<30A_{RMS} and <200A_{PK} 
<20A_{RMS} and <140A_{PK} 
<1A_{RMS} and A_{PK} 
<15V_{RMS} and <20V_{PK} 
<0.55V_{RMS} and V_{PK} 
Impedance Burden 
All 
2.5mΩ to 7mΩ 
4mΩ to 12mΩ 
0.562Ω ± 0.75mΩ 
20.5KΩ ± 0.25% 
10.25KΩ ± 0.25% 
3dB Bandwidth (typical) 
S, A or L 
1.25MHz 
W 
5MHz 
3MHz 

2.3.2. CURRENT MEASUREMENT ACCURACY

The charts below show guaranteed maximum current errors for DC, MA INS, AV IONICS, and 50kHz throughout a 1OOµA to 30A range of applied currents expressed as % of reading and are valid within ±5C of the calibration temperature (add 0.005% per C beyond this) and where no significant commonmode is present. Following the charts is a table which can be used to calculate 
2.3.2.1 PRIMARY CURRENT MEASUREMENT ACCURACY TABLE

Add relevant errors from the table below for the maximum error in primary current measurements (e.g. DC,AC, AC+ DC, Rectified, Peak, Valley, PeakValley). 
MAXIMUM SCALING ERRORS
Apply to all results as shown below as a percentage of the reading
If signal contains significant levels at multiple frequencies , apply to each level & frequency 
Specification 
Channel Type 
Option H 
Option D HI Range 
Option D LO Range 
Option X HI Range 
Option X LO Range 
Base Scaling Error
Apply to all results 
A or L 
0.03% 
S or W 
0.1% (0.2% if 2ms LF/PERIOD) 
Frequency Dependent Scaling Error
Apply to all results other than DC or MAINS 
LF or VLF 
AVIONICS 
<10kHz 
10k40kHz 
40k100kHz 
100k1MHz 
>1MHz 

S,A or L 
0.01% 
W 
0.05% 
A or L 
0.002% 
S or W 
None 
S,A or L 
F*0.003% 
W 
F*0.0015% 
S,A or L 
0.03%+(F10)*0.007% 
W 
F*0.0015% 
S,A or L 
0.24%+(F40)*0. 02% 
W 
0.06%+(F40)*0.003% 
0.06 %+(F40)*0 .004% 
S,A or L 
Typically (F/ 1250)2*100% 
W 
0.24%+(F100)*0.012% 
0.3%+(F100)*0. 015% 
W 
Typically (F/5000)2*100% 
Typically (F/3000)2*100% 
SelfHeating Scaling Error
Apply to all results (only significant at higher currents) 3 minute nominal time constant 
All 
0.00015%*A_{AC+DC}^{2} 
0.0002%*A_{AC+DC}^{2} 
None 
Temperature Scaling Error
Apply to all results if outside of ±5C from calibration temperature 
All 
0.005% per C outside of ±5C from calibration temperature 
Bandwidth Limit Scaling Error Apply if usina USER bandwidth setting 
All 
10%*(F F_{BW})^{2}, unspecified above 0.3*F_{BW} 
MAXIMUM FLOOR ERRORS
Apply to all results as shown below in Amps (generally only significant at low input 
Specification 
Channel Type 
Option H 
Option D HI Range 
Option D LO Range 
Option X HI Range 
Option X LO Range 
Base Floor Error
Apply to all results 
A or L 
56µA 
38µA 
250nA 
6µV 
150nV 
S or W 
225µA 
150µA 
1µA 
23µV 
600nV 
DC Floor Error
Apply to DC and RECTIFIED results
Apply to AC+DC results after multiplying by V_{DC}/V_{AC+DC} 
A or L 
0.23mA 
0.15mA 
1µA 
40µV 
5µV 
S 
0.45mA 
0.3mA 
2µA 
80µV 
6µV 
W 
0.68mA 
0.45mA 
3µA 
120µV 
8µV 
AC Floor Error
Apply to AC, AC+DC, and RECTIFIED results 
MAINS. LF. VLF & F_{BW}<10kHz 
AVIONICS & F_{BW}<50kHz 
Otherwise 

S,A or L 
3.3µA/A_{RDG} 
1.5µA/A_{RDG} 
90pA/A_{RDG} 
35nV/A_{RDG} 
20pV/A_{RDG} 
W 
5µA/A_{RDG} 
2.5µA/A_{RDG} 
125pA/A_{RDG} 
50nV/A_{RDG} 
50pV/A_{RDG} 
S,A or L 
33µA/A_{RDG} 
15µA/A_{RDG} 
0.9nA/A_{RDG} 
350nV/A_{RDG} 
200pV/A_{RDG} 
W 
50µA/A_{RDG} 
25µA/A_{RDG} 
1.25nA/A_{RDG} 
500nV/A_{RDG} 
500pV/A_{RDG} 
S,A or L 
330µA/A_{RDG} 
150µA/A_{RDG} 
9nA/A_{RDG} 
3.5µV/A_{RDG} 
200nV/A_{RDG} 
W 
500µA/A_{RDG} 
250µA/A_{RDG} 
12.5nA/A_{RDG} 
5µV/A_{RDG} 
5nV/A_{RDG} 
Peak Floor Error
Apply to PK, VLY and PKVLY results 
MAINS. LF. VLF & F_{BW}<10kHz 
AVIONICS & F_{BW}<50kHz 
Otherwise 

S,A or L 
8mA 
5mA 
40µA 
0.75mV 
25µV 
W 
10mA 
6.5mA 
50µA 
0.9mV 
30µV 
S,A or L 
25mA 
17mA 
125µA 
2.5mV 
65µV 
W 
30mA 
20mA 
150µA 
3mV 
80µV 
S,A or L 
75mA 
50mA 
400µA 
7.5mV 
200µV 
W 
90mA 
60mA 
500µA 
10mV 
250µV 
Common Mode Error
Apply to all results
Apply using voltage on A LO terminal relative to chassis ground. Error has 90° phase shift to commonmode voltage 
All 
500pA per V.Hz
(5.75µA@230V/50 Hz) 
400pA per V.Hz
(4.6µA@230V/50Hz) 
20pA per V.Hz
(0.23µA@230V/50Hz) 
15nV per V.Hz
(0.172mV@230V/50Hz) 
0.5nV per V.Hz
(5.75µV@230V/50Hz) 
Adjacent Channel Error
Apply to all results
Apply using adjacent channel A LO or V LO terminal voltage relative to chassis ground. Error has 90° phase shift to adjacent channel voltage 
All 
150pA per V.Hz
(1.725µA@230V/50Hz) 
120pA per V.Hz
(1.38µA@230V/50Hz) 
7pA per V.Hz
(80.5nA@230V/50Hz) 
7nV per V.Hz
(80.5µV@230V/50 Hz) 
0.2nV per V.Hz
(2.3µV@230V/50Hz) 

2.3.2.2 SECONDARY CURRENT MEASUREMENT ACCURACY TABLE

Specification 
Channel Type 
Option H 
Option D HI Range 
Option D LO Range 
Option X HI Range 
Option X LO Range 
Crest Factor Error 
All 
(Total Current Floor Error from preceding table for PK results)/A_{AC} 
Form Factor Error 
All 
(Total Current Floor Error from preceding table for AC+DC results)/A_{RECTIFIED} 
MultiChannel Error
For similar current level and phase in each phase. 
A_{N} (2θ3w) 
A_{θC} (3θ3w 2ch) 
A_{N} (3θ4w) 

All 
Relevant Current Errors from preceding table for A_{θA}
+ Relevant Current Errors from preceding table for
A_{θB} + 0.0005% of (A_{θA} + A_{θB})*F 
All 
Relevant Current Errors from preceding table for A_{θA}
+ Relevant Current Errors from preceding table for
A_{θB} + 0.0015% of (A_{θA} + A_{θB})*F 
All 
Relevant Current Errors from preceding table for A_{θA}
+ Relevant Current Errors from preceding table for
A_{θB} + Relevant Current Errors from preceding table
for A_{θC} + 0.0015% of (A_{θA} + A_{θB} + A_{θC})*F 
Harmonic or Spectrum Error 

<10kHz 
10k115kHz 
<10kHz 
10k115kHz 
<10kHz 
10k115kHz 
115k435kHz 

All 
AC Current Errors from preceding table at A and F of the harmonic or spectrum point
+ (H/N)2″0.3% of reading
+ (if not fundamental) from below using the frequency of the harmonic or spectrum Point 
A or L 
0.006% of A_{AC+DC} 
0.05% of A_{AC+DC} 
S 
0.01% of A_{AC+DC} 
0.05% of A_{AC+DC} 
W 
0.015% of A_{AC+DC} 
0.03% of A_{AC+DC} 
0.08% of A_{AC+DC} 
Current· Voltage
Fundamental Phase Error 
S, A or L 
0.005° + 0.015°*F 
W 
0.005° + 0.007°*F 
HarmonicFundamental Phase Error (typical, BANDWIDTH configured as UNFILTERED 
S, A or L 
0.02°+0.1°*F+0.001°*H 
W 
0.02°+0.03°*F+0.001°*H 
%THO Error Errors shown are all expressed in %THO units. 

<10kHz 
10k115kHz 
<10kHz 
10k115kHz 
<10kHz 
10k115kHz 
115k435kHz 

All 
(0.005+0.000025*N)*%THD+0.00005 *✓N
+ from below using the frequency of highest included harmonic 
A or L 
0.015+0.2/A_{AC} 
0.015+0.15/A_{AC} 
0.015+0.001/A_{AC} 
0.015+0.025/A_{AC} 
0.015+0.0006/A_{AC} 
0.15+2/A_{AC} 
0.15+1.5/A_{AC} 
0.15+0.01/A_{AC} 
0.15+0.25/A_{AC} 
0.15+0.006/A_{AC} 
S 
0.025+0.2/A_{AC} 
0.025+0.15/A_{AC} 
0.025+0.001/A_{AC} 
0.025+0.025/A_{AC} 
0.025+0.0006/A_{AC} 
0.15+2/A_{AC} 
0.15+1.5/A_{AC} 
0.15+0.01/A_{AC} 
0.15+0.25/A_{AC} 
0.15+0.006/A_{AC} 
W 
0.03+0.25/A_{AC} 
0.03+0.18/A_{AC} 
0.03+0.0012/A_{AC} 
0.03+0.03/A_{AC} 
0.03+0.001/A_{AC} 
0.06+2 .5/A_{AC} 
0.06+1.8/A_{AC} 
0.06+0.012 /A_{AC} 
0.06+0.3/A_{AC} 
0.06+0.01/A_{AC} 
0.15+2.5/A_{AC} 
0.15+1.8/A_{AC} 
0.15+0.012/A_{AC} 
0.15+0.3/A_{AC} 
0.15+0.01/A_{AC} 

2.4 WATTS, VAR AND VA MEASUREMENT SPECIFICATIONS

The charts below show guaranteed maximum Watts errors for DC, MAINS, AV IONICS, and 50kHz from 1OOµW up to the highest available using a D option current measurement (H and X option current accuracies are similar within their respective range of currents and are not shown for clarity), expressed as % of Watts reading and are va lid within ±5C of the calibration temperature (add 0.005% per C beyond this) and where no significant commonmode is present. Following the charts is a table which can be used to calculate the guaranteed accuracies for applications other than shown in the charts and also for the computation of 
2.4.1 WATIS, VAR AND VA MEASUREMENT SPECIFICATIONS

2.4.1.1 PRIMARY WATIS, VAR AND VA MEASUREMENT ACCURACY TABLE
Add relevant errors from the table below for the maximum error in all Watts, VA and VAR measurements except harmonic Watts.
Note that by definition DC Watts and DC VA are identical, and DC VAR is zero 
MAXIMUM SCALING ERRORS
Apply to alI results as shown below as a percentage of the reading
If signal contains significant levels at multiple frequencies, apply to each level & 
Specification 
Channel Type 
Option H 
Option D HI Range 
Option D LO Range 
Option X HI Range 
Option X LO Range 
Base Scaling Error
Apply to all results 
A or L 
0.045% 
S or W 
0.15% (0.3% if 2ms LF/PERIOD) 
Frequency Dependent Scaling Error
Apply to AC component of all results other than DC or MAINS 
LF or VLF 
AVIONICS 
<10kHz 
10k40kHz 
40k100kHz 
100k1MHz 
>1MHz 

S,A or L 
0.01% 
W 
0.05% 
A or L 
0.005% 
S or W 
None 
S,A or L 
F*0.006% 
W 
F*0.0025% 
S,A or L 
0.06%+(F10)*0.0014% 
W 
F*0.0025% 
S,A or L 
0.48%+(F40)*0.032% 
W 
0.01%+(F40)*0.005% 
0.01%+(F40)*0.0055% 
S,A or L 
Typically (F/1100)^{2}*150% 
W 
0.4%+(F100)*0.018% 
0.43%+(F100)*0.02% 
W 
Typically (F/5000)^{2}*150% 
Typically (F/3000)^{2}*150% 
SelfHeating Scaling Error
Apply as % of Power reading to all results using voltage and current Self Heating Errors from orevious tables 
All 
Add Voltage and Current SelfHeating Errors 
Temperature Scaling Error
Apply to all results if outside of ±5C from calibration tempperature 
All 
0.005% per C outside of ±5C from calibration temperature 
Bandwidth Limit Scaling Error Apply to AC component of alI results if using USER bandwidth setting 
All 
20%*(F/F_{BW})^{2}, unspecified above 0.3*F_{BW} 
MAXIMUM FLOOR ERRORS
Apply to all results as shown below in Watts, VA or VAR as applicable (generally only significant at low input 
Specification 
Channel Type 
Option H 
Option D HI Range 
Option D LO Range 
Option X HI Range 
Option X LO Range 
Base Floor Error
Apply to all results 
L 
(V_{AC+DC}*56µA) + (A_{AC+DC}*45µV) 
(V_{AC+DC}*38µA) + (A_{AC+DC}*45µV) 
(V_{AC+DC}*250nA) + (A_{AC+DC}*45µV) 
(V_{AC+DC}*6µA) + (A_{AC+DC}*45µV) 
(V_{AC+DC}*0.15µA) + (A_{AC+DC}*45µV) 
A 
(V_{AC+DC}*56µA) + (A_{AC+DC}*450µV) 
(V_{AC+DC}*38µA) + (A_{AC+DC}*450µV) 
(V_{AC+DC}*250nA) + (A_{AC+DC}*450µV) 
(V_{AC+DC}*6µA) + (A_{AC+DC}*450µV) 
(V_{AC+DC}*0.15µA) + (A_{AC+DC}*450µV) 
S or W 
(V_{AC+DC}*225µA) + (A_{AC+DC}*1.8mV) 
(V_{AC+DC}*150µA) + (A_{AC+DC}*1.8mV) 
(V_{AC+DC}*1µA) + (A_{AC+DC}*1.8mV) 
(V_{AC+DC}*23µA) + (A_{AC+DC}*1.8mV) 
(V_{AC+DC}*0.6µA) + (A_{AC+DC}*1.8mV) 
DC Floor Error
Apply to DC and AC+DC results using the Voltage and Current DC Floor Errors from previous tables 
All 
(V_{DC}*Current DC Floor Error) + (A_{DC}*Voltage DC Floor Error) + (Current DC Floor Error*Voltage DC Floor Error) 
AC Floor Error (VA and VAR only) Apply to AC and AC+DC VA & VAR results using voltage and current AC Floor Errors from previous tables 
All 
(V_{AC}*Current AC Floor Error) + (A_{AC}*Voltage AC Floor Error) 
Common Mode Error (VA and VAR only) Apply to AC component of VA and VAR results using the Voltage and Current Common Mode Errors from previous tables. 
All 
(V_{AC}*Current Common Mode Error) + (A_{AC}*Voltage Common Mode Error) 
Common Mode Error (Watts only) Apply to AC component of Watts results using the Voltage Common Mode Error from previous table 
All 
(A_{AC}*Voltage Common Mode Error) 
Adjacent Channel Error Apply to AC component of all results using the Voltage and Current Adjacent Channel Errors from previous tables 
All 
(V_{AC}*Current Adjacent Channel Error) + (A_{AC}*Voltage Adjacent Channel Error) 
Phase Floor Error (Watts only) Apply to AC and AC+DC Watts results 
s, A or L 
VA_{FUND}*(PF_{FUND} – cos(cos^{1}(PF_{FUND}) + 0.015 F))
Alternately, as a worst case (at PF=O) this can expressed as F*0.028% of VA 
W 
VA_{FUND}*(PF_{FUND} – cos(cos^{1}(PF_{FUND}) + 0.007°*F))
Alternately ,as a worst case (at PF=O) this can expressed as F*0.013% of VA 

2.4.1.2 HARMONIC WATTS MEASUREMENT ACCURACY TABLE

Specification 
Channel Type 
Option H 
Option D HI Range 
Option D LO Range 
Option X HI Range 
Option X LO Range 
Harmonic or Spectrum Error 

<10kHz 
10k115kHz 
<10kHz 
10k115kHz 
<10kHz 
10k115kHz 
115k435kHz 

All 
AC Watts Errors other than Phase Floor Error from preceding table at levels and F of the harmonic or spectrum point + (H/N)2*0.5% of reading
+ from below using the frequency of the harmonic or spectrum point 
A or L 
0.006% + (0.004%+0.028%*F)/PF 
0.05% + (0.004%+0.028%*F)/PF 
S 
0.01% + (0.004%+0.028%*F)/PF 
0.05% + f0.004%+0.028%*Fl/PF 
W 
0.015% + (0.004%+0.013%*F)/PF 
0.03% + (0.004%+0.013%*F)/PF 
0.08% + f0.004%+0.013%*Fl/PF 

2.5.1 PF MEASUREMENT ACCURACY TABLE

Add relevant errors from the table below tor the maximum error in PF measurements. For PFFUND apply only the Base Floor and Phase Errors.
Note: DC PF is 1.0 by definition and has no error; the table below applies to AC, AC+DC and FUND PF results. 
Specification 
Channel Type 
Option H 
Option D HI Range 
Option D LO Range 
Option X HI Range 
Option X LO Range 
Base Floor Error Apply to all PF results 
L 
(56µA/A_{AC+DC}) + (45µV/V_{AC+DC}) 
(38µA/A_{AC+DC}) + (45µV/V_{AC+DC}) 
(250nA/A_{AC+DC}) + (45µV/V_{AC+DC}) 
(6µA/A_{AC+DC}) + (45µV/V_{AC+DC}) 
(0.15µA/A_{AC+DC}) + (45µV/V_{AC+DC}) 
A 
(56µA/A_{AC+DC}) + (450µV/V_{AC+DC}) 
(38µA/A_{AC+DC}) + (450µV/V_{AC+DC}) 
(250nA/A_{AC+DC}) + (450µV/V_{AC+DC}) 
(6µA/A_{AC+DC}) + (450µV/V_{AC+DC}) 
(0.15µA/A_{AC+DC}) + (450µV/V_{AC+DC}) 
S or W 
(225µA/A_{AC+DC}) + (1.8mV/V_{AC+DC}) 
(150µA/A_{AC+DC}) + (1.8mV/V_{AC+DC}) 
(1µA/A_{AC+DC}) + (1.8mV/V_{AC+DC}) 
(23µA/A_{AC+DC}) + (1.8mV/V_{AC+DC}) 
(0.6µA/A_{AC+DC}) + (1.8mV/V_{AC+DC}) 
AC Floor Error Apply to all PF results using voltage and current AC Floor Error from previous tables this error always causes a reduced PF reading 
All 
PF_{RDG}*((Current AC Floor Error/A_{RDG}) + (Voltage AC Floor Error/V_{RDG})) 
DC Floor Error Apply to AC+DC PF result after multiplying by (1PF) 
L 
(0.23mA/A_{AC+DC}) + (0.1mV/V_{AC+DC}) 
(0.15mA/A_{AC+DC}) + (0.1mV/V_{AC+DC}) 
(1µA/A_{AC+DC}) + (0.1mV/V_{AC+DC}) 
(40µA/A_{AC+DC}) + (0.1mV/V_{AC+DC}) 
(5µA/A_{AC+DC}) + (0.1mV/V_{AC+DC}) 
A 
(0.23mA/A_{AC+DC}) + (1mV/V_{AC+DC}) 
(0.15mA/A_{AC+DC}) + (1mV/V_{AC+DC}) 
(1µA/A_{AC+DC}) + (1mV/V_{AC+DC}) 
(40µA/A_{AC+DC}) + (1mV/V_{AC+DC}) 
(5µA/A_{AC+DC}) + (1mV/V_{AC+DC}) 
S 
(0.45mA/A_{AC+DC}) + (3mV/V_{AC+DC}) 
(0.3mA/A_{AC+DC}) + (3mV/V_{AC+DC}) 
(2µA/A_{AC+DC}) + (3mV/V_{AC+DC}) 
(80µA/A_{AC+DC}) + (3mV/V_{AC+DC}) 
(6µA/A_{AC+DC}) + (3mV/V_{AC+DC}) 
W 
(0.68mA/A_{AC+DC}) + (5mV/V_{AC+DC}) 
(0.45mA/A_{AC+DC}) + (5mV/V_{AC+DC}) 
(3µA/A_{AC+DC}) + (5mV/V_{AC+DC}) 
(120µA/A_{AC+DC}) + (5mV/V_{AC+DC}) 
(8µA/A_{AC+DC}) + (5mV/V_{AC+DC}) 
Phase Error Apply to all PF results 
S, A or L 
(PF_{FUND} – cos(cos^{1}(PF_{FUND}) ± 0.015°*F))
Alternately, as a worst case (at PF=O) this can expressed as F*0.00028 
W 
(PF_{FUND} – cos(cos^{1}(PF_{FUND}) ± 0.007°*F))
Alternately, as a worst case (at PF=O) this can expressed as F*0.00013 

3.3 ANALOG INPUT MEASUR EMENT SPECIFICATIONS

Maximum Input Error 
0.05% + 1mV
Add (0.005% + 50µV) per C outside of ±5C from calibration temperature 
4 ANALYSIS SPECIFICATIONS

4.1 INTEGRATION SPECIFICATIONS

Start Delay Time 
Zero to 99 days, 99 hours, 99 minutes, 99 seconds (1 second resolution) 0.01% + 8ms maximum error 
Integration Time 
Manual{unrestricted period of time),or 1 second to 99 days), 99 hours, 99 minutes, 99 seconds 0.01% + lms maximum error 
Maximum Data 
{0.01% + 1ms) (not for integrated average data) {0.03/measurement period in seconds)% per year error 
4.2 HARMON IC ANALYSIS SPECIFICATIONS

Method 
DFT performed at each frequency on same set of sampled signals (there is no discontinuity throughout the analysed frequency range) 
Window Maximum 
F> (measurement period): Hann (also called Hanning) Otherwise: Rectangular 
Harmonic 
The smaller of –
a) A frequency of 435KHz (W type charnels) or 115KHz {otherwise)
b) 500^{th} (harmonic over the 100^{th}, requires option H500)
c) HARMONICS setting
d) If BANDWIDTH set to USER:0.5’setting/fundamental frequency 
Harmonic Bandwidth 
Nominally the greater of
a) The smaller of fundamental frequency or 2/LF PERIOD measurement period)
b) If FUND set to AVIONICS:20Hz
c) (Fundamental frequency* Maximum Harmonic/2250) 
Measurement 
Nominally (1/Ham ionic Bandwidth) 
Period Update Internal 
Nominally the greater of –
a) LF/PERIOD measurement period
b) Ham ionic Measurement Period {from above)
c) 0.25ms x ∑(Maximum Harmonic for each channel configured for harmonics) 
Data Available 
Volts,Amps and Watts amplitudes for each configured harmonic
Volts and Amps as a percentage of the fundamental of the same signal
Volts and Amps THD as a percentage of the fundamental of the same signal
Volts and Amps THD as a percentage of the AC+DC am platitude of the same signal
V and A Phase of fundamental relative to the voltage fundamental of the lowest numbered channel in the VPA
V and A Phase of each nonfundamental ham ionic relative to the fundamental of the same signal 
Accuracy 
See relevant Voltage,Current and Watts accuracy specifications 
4.3 SPECTR UM ANALYSIS SPECIFICATIONS

Method 
DFT performed at each frequency on same set of sampled signals (there is no discontinuity throughout the analysed frequency range) 
Window 
Hann (also called Hanning) 
Frequency 
0.01Hz to 1KHz 
Resolution 
Nominally (1/frequency Resolution) 
Measurement Period 
minimum is 100 x Frequency Resolution 
Maximum Frequency 
Maximum is the lowest of nominally –
a) 16384 x frequency Resolution (under some circumstances as low as B192 x frequency Resolution)
b) 435KHz (W type channels) or 115KHz {otherwise) 
Data Available 
Volts, Amps am Watts amplitudes for each configured spectrum 
Accuracy 
frequency See relevant Voltage,Current and Watts accuracy specifications 
4.4 CYCLE VIEW SPECIFICATIONS

Signal Range 
As specifications for Voltage and Current 
2.6 FREQUENCY MEASUREMENT SPECIFICATIONS

Frequency Range 
FUND setting of MAINS:45Hz to 65Hz
FUND setting of AVIONICS:300Hz to 900Hz Otherwise
LF/PERIOD setting of VLF:0.0099Hz to 65Hz
LF/PERIOD setting of LF:0.19Hz to 1KHz
LF/PERIOD setting of 300ms period:9Hz to 305KHz (W channel type) or 80KHz (other channel types) LF/PERIOD setting of 100ms period: 19Hz to305KHz (W channel type) or 80KHz (other channel types) LF/PERIOD setting of 20ms period: 44Hz to 305KHz (W channel type) or 80KHz (other channel types) LF/PERIOD setting of 10ms period: 145Hz to 305KHz (W channel type) or 80KHz (other channel types) LF/PERIOD setting of 2ms period:495Hz to 305KHz (W channel type) or 80KHz (other channel types) If BANDWIDTH set to USER setting then upper limit is 0.5*setting 
DC Level 
DC offset is automatically eliminated 
Min. input (typical) 
Voltage: 0.5Vrms (W, S or A channel type) or 75m Vrms (L channel type) at fundamental Current,H option:0.05Arms at fundamental
Current,D option: 0.04 Arms (HI range)or 0.3m Arms (LO range) at fundamental Current,X option: 5m Vrms (HIrange) or 150µ Vrms (LO range) at fundamental 
Min.Pulse Width (typical) 
Greater of
1.25µs (W channel type) or 5µs (other channel types) 0.001% of measurement period 10% of signal period 
Update Period (nominal) 
As shown below for FREQ SPEED settings of FAST/NORMAL/SLOW respectively – LF/PERIOD setting of VLF:greater of 1/2/15s or 1 cycle LF/
PEROD setting of LF:greater of 1/1/5s or 1 cycle LF/
PEROD setting of 300ms period: 0.25s/O.75s/2s LF/PEROD setting of 100ms period: 55ms/250ms/1s LF/PEROD setting of 20ms period: 25ms/200ms/700ms LF/ PERIOD setting of 1Oms period: 1Oms/l00ms/300ms LF/PEROD setting of
2ms period:2ms/50ms/150ms 
Resolution 
W Channel Type:0.000125%/Update Period in seconds Otherwise:0.0005%/Update Period in seconds 
(nominal) Maximum 
0.01% + Resolution 
Setting Time (nominal) Error 
Greater of (2 if significant DC content) –
a) 2 amp litude periods
b) 2 frequency measurement periods
c) 4 cycles of the signal 
3. MECHANICAL CHANNEL INPUT AND ACCURACY SPECIFICATIONS (MT TYPE)

3.1 INPUT CAPABILITIES AND CHARACTERISTICS

Input Terminals 
SPD {Speed): BNC(Isolated from XT2640 chassis), configurable as analog or digital input TRQ (Tarque):BNC(isolated from XT2640 chassis), configurable as analog or digital input DIR (Direction) : BNC (isolated from XT2640 chassis), digital input 
Input CommonMode 
Up to15V_{PK} to + 15V_{PK} specified
Up to30V_{PK} to + 30V_{PK} with no damage 
Analog Input Range 
Up to12V_{DC} to + 12V_{DC} specified
Up to15V_{PK} to + 15V_{PK} specified
Up to30V_{PK} to + 30V_{PK} with no damage 
Digital Input Range 
LO:<0.5V (nominal)
HI:>2V (nominal)
Up to30V_{PK} to + 30V_{PK} with no damage 
Input Impedance 
Each input nominally 150KΩ to XT2640 chassis ground 
3.2 DIGITAL INPUT MEASUREMENT SPECIFICATIONS

Digital Frequency Timing 
Signal must be LO for >500ns
Signal must be HI for >500ns
Frequency measurement up to 500KHz {typically 900KHz)
Minimum measurable frequency limited by user set measurement period 
DIR Setup/Hold Timing 
DIR must bestable for >550ns prior to and after active edge of SPD input 
Maximum Frequency Error 
Measurement Period >10ms: 0.01%
Measurement Period <lOms: 0.015% 
Cycle Period Time 
From 2.3us (W type channels), 8.7us (otherwise) up to 100 seconds 
Resolution Method 
1/512^{th} of a cycle 
Maximum Error 
Mean cycle formed by asynchronously sampling all cycles within measurement period
As Voltage and Current Specifications tor PK data 011/atts = multiplication of V and A waveforms) 
4.5 SCOPE SPECIFICATIONS

Signal Range 
As specifications for Voltage and Current 
Timebase 
1/2/5 settings from Sus/div to 20s/div 
Capture Depth 
Up to 32k points per signal 
Capture Resolution 
<0.00005% of specified maximum measurable peak Voltage or Current 
Sampling Period (nominal) 
Greater of –
1.1µs 011/ type channels) or 4.1µs
(otherwise) 0.03% of timebase setting 
Maximum Error 
As Voltage and Current Specifications for PK data 011/atts = multiplication of V and A waveforms) 
4.6 HISTORICAL DATA COLLECTION SPECIFICATIONS

Collection Time 
Automatically continuously variable between 1 measurement period and 584.5 million years (collection is automatically stopped after this time has elapsed but this is untested at the time of writing) 
Time 
Note: this is the resolution by which you can determine when an event occurred, not that of the XT2640 detecting events. All events are captured. 
Resolution 
The greater of
a) 1 pixel of displayed data (front panel) or 1 increment of the requested time interval (interface)
b) 1 measurement period of the data being recorded
c) A maximum of 1/4096th of the elapsed historical data collection time (typically 1/8192th). 
Data Capture 
Every measurement is included in the maximum, average and minimum data tor each increment of the time resolution interval regardless of the time resolution. 
4.7 DATA LOGGING SPECIFICATIONS

Logged Measurements 
Up to 16 measurement data per record (each of which can be 1 measurement or up to 500 harmonic measurements) 
Data per Record 
Up to 8003 data per record 
Internal FIFO 
32Mbyte (always in binary format, 4 bytes per data) 
Buffer Internal 
>2Gbyte (always in binary format, 4 bytes per data) nonvolatile Typically 
Memory 
5Mbytes/sec maximum sustained mean write rate 
External Data File Format 
ASCII (CSV, scientific format) or Binary 
Timestamp 
Record number + optional date and time (1 second resolution) 
Maximum File Size 
4Gbyte 
Maximum Records 
Only limited by maximum file size 
Start Delay Time 
Zero to 99 days, 99 hours, 99 minutes, 99 seconds (1 second resolution) 0.01% + 8ms maximum error 
Run Time 
Manual (unrestricted period of time), or 1 second to 99 days, 99 hours, 99 minutes, 99 seconds (1 second resolution)
0.01% + 8ms maximum error 
Log Interval 
0.002 second, or 0.01 second to 99 hours, 99 minutes, 99.99 seconds (0.01 second resolution) 0.01% maximum error ± 2ms nonaccumulating error 