Precision Digital PD650 - Manual (Page 33)

Model PD650 Large Display Process Meter Instruction Manual
33
Select Calibration Method
For best results, allow the meter to warm up for at least 30 minutes.
The meter may be calibrated using an external signal source such as a calibrator
or scaled using the internal source with the I-CAL feature. With I-CAL, a 4-20
mA input can be scaled for any display range without applying a signal. To scale
inputs such as 0-5 V, 1-5 V, or 0-10 V without applying a signal, it is necessary to
first complete an Initial Calibration (see Initial Calibration With External Source
(if Needed)) below.
To select Calibration Method, apply power with ACK button pressed.
1. When display stops flashing, release ACK button. Display alternates
between E-CAL and I-CAL.
2. To calibrate meter with an external source, such as a calibrator, press
ENTER when E-CAL appears.
To scale meter with internal source, press ENTER when I-CAL appears.
Initial Calibration With External Source (if Needed)
For best results, allow the meter to warm up for at least 30 minutes. Initial
calibration is required only when the I-CAL feature is to be used with an input
other than the default 4-20 mA range or it is time for recalibration.
1. Make sure the jumper on JP1, is set for the desired input (see Figure 16,
page 32).
2. Apply power with ENTER and ACK buttons pressed. Release when display
stops flashing.
3. The meter scrolls through the choices sel 20, sel 5, and sel 10, which
correspond to select input signals of 4-20 mA, 0-5 V or 1-5 V, and 0-10 V.
Press ENTER when desired value appears.
4. The meter flashes InPt 1. Apply low-end signal, (4 mA or 0 V), press
ENTER.
(For 1-5 V input signals calibrate meter with input 1 = 0 V, input 2 = 5 V)
5. The meter flashes InPt 2. Apply high-end signal (20 mA, 5 V, 10 V), press
ENTER.
6. This completes the Initial Calibration and initializes input 1 and input 2
scaling points to 4.000 & 20.000 mA, 0.000 & 5.000 V, or 0.000 & 10.000 V.