Fluke 8842a instruction manual Self-Test Descriptions, Test Number, Test Point Voltage

8842A

Instruction Manual

6-39. Self-Test Descriptions

TEST NUMBER

Table 6-18. Self-Test Voltages

TEST POINT VOLTAGE

1	TP803	±5 mV dc
2	TP803	±5 mV dc
3	TP803	±5 mV dc
4	TP103	T/H output waveform for zero input (Figure 6-14)
5	TP302	±5 mV dc
6	TP302	±5 mV dc
7	TP302	+50 mV dc typical
8	TP302	+11.5V dc typical
9	TP302	+11.5V dc typical
10	TP302	+4.5V dc with possibly 1V ac (p-p) at 10 Hz
11	TP302	+4.5V dc with possibly 1V ac (p-p) at 10 Hz
12	TP302	+4.5V dc with possibly 1V ac (p-p) at 10 Hz
13	TP302	+4.5V dc with possibly 1V ac (p-p) at 10 Hz
14	TP302	+4.5V dc with possibly 1V ac (p-p) at 10 Hz
15,22	TP302	+50 mV dc typical
16	TP302	+49 mV dc typical
17	TP302	+53 mV dc typical
18	TP302	+59 mV dc typical
19	TP302	<±5 mV dc
20	TP302	+59 mV dc
21	TP302	<±5 mV dc

Note: To measure these correctly, each test must be stopped using the SRQ button.

Also use TP306 (or L-shaped shield around U202) as Reference low.

∙TEST 1: 200 VAC, Zero

Configures the 8842A in the 200V ac range (except that K801 is opened) and measures the open-circuit floor reading. In this range, the first and second stage buffers effectively divide any noise at the input terminals by 100. This test should be fairly immune from noise because the input terminals are always open-circuited except for capacitive feedthrough across K801.

∙TEST 2: 700 VAC, Zero

Configures the 8842A in the 700V ac range and measures the open-circuit floor reading. In this range, the open-circuit reading is divided by 1000. Again, K801 is opened to reduce sensitivity to external noise.

∙TEST 3: mA AC, Zero

Configures the 8842A exactly as in the mA AC function and takes a reading of the voltage across the 0.1Ω current shunt at the slow reading rate.

∙TEST 4: mA DC, Zero

6-42