Self-Test Descriptions; Self-Test Voltages - Fluke 8842A Instruction Manual

8842A
Instruction Manual

6-39. Self-Test Descriptions

TEST NUMBER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15,22
16
17
18
19
20
21
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.
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.
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.
Configures the 8842A exactly as in the mA AC function and takes a reading of the
voltage across the 0.1 current shunt at the slow reading rate.
6-42
Table 6-18. Self-Test Voltages
TEST POINT
TP803
TP803
TP803
TP103
TP302
TP302
TP302
TP302
TP302
TP302
TP302
TP302
TP302
TP302
TP302
TP302
TP302
TP302
TP302
TP302
TP302
TEST 1: 200 VAC, Zero
TEST 2: 700 VAC, Zero
TEST 3: mA AC, Zero
TEST 4: mA DC, Zero
VOLTAGE
±5 mV dc
±5 mV dc
±5 mV dc
T/H output waveform for zero input (Figure 6-14)
±5 mV dc
±5 mV dc
+50 mV dc typical
+11.5V dc typical
+11.5V dc typical
+4.5V dc with possibly 1V ac (p-p) at 10 Hz
+4.5V dc with possibly 1V ac (p-p) at 10 Hz
+4.5V dc with possibly 1V ac (p-p) at 10 Hz
+4.5V dc with possibly 1V ac (p-p) at 10 Hz
+4.5V dc with possibly 1V ac (p-p) at 10 Hz
+50 mV dc typical
+49 mV dc typical
+53 mV dc typical
+59 mV dc typical
±5 mV dc
+59 mV dc
±5 mV dc