TB 9-6625-174-24
APPENDIX B
PERFORMANCE TABLES
Extech, Model MA640 Continued
Table B-239. DC Current (≤500 A) (w/50 Turn Coil).
Calibrator output
Test instrument
Applied
Range
Limits (A dc)
(A dc)
(A dc)
Min
Max
1.08
60
52.44
55.56
Table B-240. DC Current (≤1000 A) (w/50 Turn Coil).
Calibrator output
Ammeter calibrator
Test instrument
Applied
Range
Range
Limits (A dc)
(V dc)
(A dc)
(A dc)
Min
Max
1.08
20
600
523.3
556.7
Table B-241. AC Current (≤500 A) (w/50 Turn Coil).
Calibrator output
Test instrument
Applied
Range
Limits (A dc)
(A ac)
(A ac)
Min
Max
1.08 @ 50 Hz
60
52.41
55.59
1.08 @ 60 Hz
60
52.41
55.59
Table B-242. AC Current (≤1000 A) (w/50 Turn Coil).
Calibrator output
Ammeter calibrator
Test instrument
Applied
Range
Range
Limits (A ac)
(V ac)
(A ac)
(A ac)
Min
Max
1.08 @ 50 Hz
20
600
523
557
1.08 @ 60 Hz
20
600
523
557
Table B-243. Resistance.
Calibrator output
Test instrument
Limits (Ω)
Applied
Range
(Ω)
(Ω)
Min
Max
190
600
-1.2105% (187.7)
+1.2105% (192.3)
1.9 k
6k
-1.605% (1.869 k)
+1.605% (1.931 k)
19 k
60 k
-1.605% (18.69 k)
+1.605% (19.31 k)
190 k
600 k
-1.605% (186.9 k)
+1.605% (193.1 k)
1.9 M
6M
-2.6579% (1.849 M)
+2.6579% (1.951 M)
19 M
60 M
-3.7632% (18.28 M)
+3.7632% (19.72 M)
Table B-244. Frequency.
output1
Calibrator
Test instrument
Limits (Hz)
Applied
Range
(Hz)
Min
Max
10 Hz @ 15 V
Hz
9.86
10.14
1 kHz @ 15 V
Hz
986
1.014 k
10 kHz @ 15 V
Hz
9.86 k
10.14 k
Substitute calibrator for function generator in step 15 a (1).
1
B-69
