14
The registration of the instrument may be calculated in the following manner:
%Error
Meter Reading Expected Reading
Expected Reading
%Registration %Error
=
×
=−
100
100
The test may be repeated by:
1. Opening pendulum switch, reset instrument under test.
2. Press enter key twice (to enter VA and VAS).
3. Assert Operate 811A.
4. Close pendulum switch.
2.4.14 Availability of Additional Signals
Additional signals are available at connector P30, located at the rear of the unit. These
signals and their pin connection, are as follows.
Pin # Signal Label Logic
16, 18, 20 +10 unregulated
29, 3l, 33 Logic ground
35, 37, 39 Logic ground
22 Load applied
38 + Energy gate
40 - Energy gate
24 start VAS time-out Input negative assertion
26 start KVAS time-out Input negative assertion
Example: For automatic start-stop testing of rotating watt-hour meters (i.e. G.E. Model IB-10)
connect pin 22 of P30 to pin 24 for VAS time-out or to pin 26 for KVA SEC time-out. At the end of the
time-out the Model 811A will automatically go into the Standby mode and the Enter Volts and Error
light will be illuminated. This is to alert the operator that the Energy information has to be re-entered.
By pressing the "Enter" key two times the 811A is now ready for a new test.
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