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Page 13
Prior to connecting the 951 to the Flowmeter or Controller, verify that the
Controller's +/-15 vdc requirement is no more than 400 ma. The 951 is
capable of supplying up to 500ma for short periods of time ( in 1/2 or 1 hour
increments). Consult the factory if the current requirement is > 350ma for
prolonged periods of time.
Connect the 951 to the Flowmeter or Controller or a precision voltage
source with an accuracy of 0.01% or better per Figure 3. The voltage
source should be connected between J1-1 and J1-2. Apply AC power to
the 951. Verify that the 951 lights up and the instrument is displaying a
stable reading. If no display appears after 1 or 2 seconds has elapsed,
remove the ac power and check the fuse contained in the AC Power
Connector at the rear of the 951 (Reference Figure 2 on page 3).
If a stable display appears, allow 15-30 minutes for the 951 to stabilize, then
perform the calibration procedure shown below.
1. The FS Cal (CAL) value must be entered prior to performing this
calibration procedure. Reference page 8 to enter the FS Cal (CAL)
value.
2. Apply zero flow to the Flowmeter, if calibration is done with a Flowmeter,
or zero vdc to the 951, if calibration is done with a precision voltage
source.
3. Depress and hold CAL (S5) switch for approximately 3 seconds. Verify
FS CAL annunciator is extinquished. The 951 is now uncalibrated.
4. Depress and hold the ZERO (S4) switch for approximately 3 seconds
(Reference Figure 1 on page 3). Verify ZERO annunciator LED is
illuminated and the display reads 0000 +/- 0001 counts. Ignore the
decimal point. The 951 is now zeroed.
5. Apply full scale flow to the Flowmeter or 5.000 vdc +/- 0.0005 vdc to
the 951.
CALIBRATION INSTRUCTIONS