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HYDRA
Service Manual
5A-28
Basic dc measurements depend on the zener reference (A3VR1), reference divider
network (A3Z2), and integrate resistors (A3Z2). Resistance measurements and dc
measurements above three volts additionally depend on the resistors in the dc divider
network (A3Z4). AC measurements depend on the ac divider network (A3Z3), ac buffer
(A3U7), and RMS converter (A3U6), as well as the basic dc measurement components.
Note
During calibration, the measurement rateis selected automatically as
required by thecalibration step.
Table 5A-9 may be useful in isolating a calibration problem to specific components.
Table 5A-9. Calibration Faults (for software versions 5.4 and above) (2635A)
Input Range
Calibration Constant
Related Components
Number Acceptable Values
DC Volts
0.09000V
0.9000V
0.29000V
2.9000V
29.000V
290.00V
100 mV
1V
300 mV
3V
30V
300V
1
2
3
4
5
6
1.0315 to 1.1565
1.0340 to 1.1540
1.0315 to 1.1565
1.0315 to 1.1565
1.0340 to 1.1640
1.0290 to 1.1590
A3VR1, A3Z2
A3VR1, A3Z2
A3VR1, A3Z2
A3VR1, A3Z2
A3VR1, A3Z2, A3Z4
A3VR1, A3Z2, A3Z4
AC Volts (1 kHz)
0.02900V
0.29000V
0.2900V
2.9000V
2.900V
29.000V
29.00V
290.00V
300 mV
300 mV
3V
3V
30V
30V
300V
300V
7
8
9
10
11
12
13
14
-0.001 to 0.001
1.0040 to 1.1840
-0.01 to 0.01
1.0040 to 1.1840
-0.1 to 0.1
1.0040 to 1.1840
-1.0 to 1.0
1.0040 to 1.1840
A3U6, A3VR1, A3Z1, A3Z2, A3Z3
A3U6, A3VR1, A3Z1, A3Z2, A3Z3
A3U6, A3VR1, A3Z1, A3Z2, A3Z3
A3U6, A3VR1, A3Z1, A3Z2, A3Z3
A3U6, A3VR1, A3Z1, A3Z2, A3Z3
A3U6, A3VR1, A3Z1, A3Z2, A3Z3
A3U6, A3VR1, A3Z1, A3Z2, A3Z3
Ohms
290.00Ω
2.9000 kΩ
29.000 kΩ
290.00 kΩ
2.9000 MΩ
2.9000 MΩ
300Ω
3 kΩ
30 kΩ
300 kΩ
3 MΩ
10 MΩ
15
16
17
18
19
20
0.9965 to 1.0115
0.9975 to 1.0125
1.0015 to 1.0165
0.9965 to 1.0115
0.9990 to 1.0090
0.9990 to 1.0090
A3Z2, A3Z4
A3Z2, A3Z4
A3Z2, A3Z4
A3Z2, A3Z4
A3Z2, A3Z4
A3Z2, A3Z4
Frequency
10.000 kHz
2.9V rms
21 0.9995 to 1.00050005 A3Y2