Potentiometric Recorder - Fluke 825A Instruction Manual

Model Maximum Total
No.
Input Resistance
Voltage
BOA-1 1 KV lM
BOA-2 2 KV 2M
BOB-5
5 KV 5M
BOB-10
10 KV lOM
BOC-15
15 KV 15 M
BOC-20
20 KV 20 M
BOC-25 25 KV 25 M
BOC-30 30 KV 30 M
MODELS
SIZE
BOA 6-3/4" high
5-1/ 4" wide
2:..1/4" deep
BOB 10-9/32" high
B" wide
10" deep
BOC
13" high
9-3/4 " wide
16" deep
Current Division Ratio
Division Stability of
Temp. Coef.
Drawn At
Division
of
500
v
lV
Accuracy
Accuracy
Max. Input Out Out
Per Year
Division Ratio
1 ma 2:1
- -
±0. 015%
- -
- -
4:1
- -
1 ma 10:1 5, 000:1 ±0. 01% ±0. 005%
±0. 005%/0C
20:1
10, 000:1
from ooc to 600C
30:1 15,000:1
1 ma 40:1 20, 000:1 ±0. 01% ±0. 0005%
±0. 00023; 0 c
50:1
25, 000:1
from ooc to 35oc
60:1 30, 000:1
INPUT OUTPUT
CONNECTOR CONNECTOR
UG- 560U with mating connector Insulated binding posts on 3/4"
supplied
centers
AN3102-1B-165 with mating
Insulated binding posts on 3/4"
connector supplied centers for both outputs
Special 5" ceramic standoff with
Insulated binding post on 3/4"
mating B" polystyrene connector
centers for both outputs
supplied
6-2. POTENTIOMETRIC RECORDER
The Fluke Model A-70 Self Balancing Potentiometric Re-
corder is a special purpose high sensitivity recorder de-
veloped for monitoring voltages measured by the
W
BOO
Series Differential Voltmeters. In addition to providing a
permanent record of results, the recorder allows un-
attended monitoring of various voltages from 0 to 500
volts for long periods of time. A sample voltage which
varies in direct proportion to the source under measure-
ment is obtained from the voltmeter null detector by
connecting the recorder to the output terminals at the
rear of the voltmeter. A gain adjustment control adjacent
to the voltmeter output terminals allows the sample vol-
tage to be adjusted such that full-scale meter deflection
equals full-scale recorder deflection. The large leakage
resistance (500, 000 megohms} between the recorder in-
put posts and chassis is such that the inherently high
accuracy of the Fluke Differential Voltmeter is generally
not impaired in any way.
Electrical Span:
10
mv DC
Span Step Response Time: Less than 0. 5 seconds
Accuracy: 0. 5% of span
Chart Speeds: 0. 75, 1. 5, 3. 6, or
12 in. /min. or in. /hr.
MODEL A-70 POTENTIOMETRIC RECORDER
Dimensions: Cabinet Model -
6-2
Cabinet Model--9-1/4" high, B-1/4" wide, 15" deep.
Rack Model--Available on special request.
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