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Introduction and Specifications
SPECIFICATIONS
1
1-3
1-4. SPECIFICATIONS
Specifications for the 8842A are given in Table 1-1. External dimensions are shown in
Figure 1-1.
Table 1-1. Specifications
DC VOLTAGE
Input Characteristics
RESOLUTION
RANGE
FULL SCALE 5ñ
DIGITS
5ñ DIGITS 4ñ DIGITS*
INPUT
RESISTANCE
20 mV 19.9999 mV 0.1µV1 µV ≥10,000 MΩ
200 mV 199.999 mV 1µV 10 µV ≥10,000 MΩ
2V 1.99999V 10 µV 100 µV ≥10,000 MΩ
20V 19.9999V 100 µV1 mV≥10,000 MΩ
200V 199.999V 1 mV 10 mV 10 MΩ
1000V 1000.00V 10 mV 100 mV 10 MΩ
*4ñ digits at the fastest reading rate.
Accuracy
NORMAL (S) READING RATE ............. ±(% of Reading + Number of Counts)
RANGE 24 HOURî 23±1°C 90 DAY 23±5°C 1 YEAR 23±5°C 2 YEAR 23±5°C
20 mV
2
0.0050 + 20
3
0.0070 + 30
3
0.0100 + 30
3
0.0120 + 40
3
200 mV
2
0.0030 + 2 0.0045 + 3 0.0070 + 3 0.0100 + 4
2V 0.0015 + 2 0.0025 + 2 0.0030 + 2 0.0050 + 3
20V 0.0015 + 2 0.0030 + 2 0.0035 + 2 0.0060 + 3
200V 0.0015 + 2 0.0030 + 2 0.0035 + 2 0.0060 + 3
1000V 0.0020 + 2 0.0035 + 2 0.0045 + 2 0.0070 + 3
1. Relative to calibration standards.
2. Within one hour of dc zero, using offset control.
3. When offset control is not used the number of counts are 50, 70, 90 and 90 for 24 hours, 90 day, 1
year, and 2 year respectively.
4. When offset control is not used the number of counts are 5, 7, 9 for 24 hours, 90 day, 1 year, and 2
year respectively.
MEDIUM AND FAST RATES: ................In medium rate, add 3 counts (20 counts on 20 mV Range) to
number of counts. In fast rate, use 2 (4½ digit mode) counts
(30 counts on 20 mV range) for the number of counts