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Maintenance
PERFORMANCE TEST
6
6-9
Table 6-5. Resistance Test
Error From Input
1
(in counts)Step Range Input
(Nominal)
Slow Medium Fast
2
120Ω
3
0Ω (short) ±40 ±60 ±20
220Ω
3
10Ω ±49 ±69 ±21
3 200Ω
3
0Ω (short) ±4 ±6 ±3
4 200Ω
3
100Ω ±11 ±13 ±4
52 kΩ 0Ω (short) ±3 ±5 ±2
62 kΩ 1 kΩ ±8 ±10 ±3
7 20 kΩ 0Ω (short) ±3 ±5 ±2
8 20 kΩ 10 kΩ ±8 ±10 ±3
9 200 kΩ 0Ω (short) ±3 ±5 ±2
10 200 kΩ 100 kΩ ±9 ±11 ±3
11 2000 kΩ 0Ω (short) ±3 ±6 ±2
12 2000 kΩ 1 MΩ ±28 ±31 ±5
13 20 MΩ 0Ω (short) ±4 ±7 ±2
14 20 MΩ 10 MΩ ±44 ±47 ±6
1 – Using offset control
2 = 4 ½ digit counts
3 = Applies to 4-wire ohms only
6-7. DC Current Test
The following procedure may be used to test the mA DC function:
1. Ensure the 8842A is on and has warmed up for at least 1 hour.
2. Select the mA DC function.
3. Connect the Current Source to the 2A and LO INPUT terminals.
4. For each step in Table 6-6, set the Current Source for the indicated input and verify
that the displayed reading is within the limits shown for each reading rate.
5. Set the Current Source for zero mA and disconnect it from the 8842A.
Table 6-6. DC Current Test
DISPLAYED READING
SLOW MEDIUM FAST
STEP RANGE INPUT
MIN MAX MIN MAX MIN MAX
1 200 mA 0 mA -00.040 +00.040 -00.060 +00.060 -00.20 +00.20
2 200 mA 100 mA 99.920 100.080 99.900 100.100 99.76 100.24
3 2000 mA 0 mA -000.04 +000.04 -000.06 +000.06 -000.2 +000.2
4 2000 mA 1000 mA 999.56 1000.44 999.54 1000.46 999.4 1000.6