Practical Instrument Electronics 525 Rev F - Manual (Page 2)

Model 525 Operating Instructions
841 Holt Road #1 • Webster, NY 14580 Tel: 585-872-9350 • Fax: 585-872-2638 [email protected] • http://www.piecal.com/
Practical Instrument Electronics, Inc. Copyright © 2004. All rights reserved. 525-9002 5/26/05 2-8
Store/Step
To select three test point values you first have to select Store,
1. Select your high range by sliding the Hi/Lo slide switch to the HI position and dial it to the range desired then press and
hold the EZ-Dial™ Knob until STORED appears to store the value.
2. Slide the Hi/Lo slide switch to the middle position (dial) and dial it to the range desired. You do not have to press store
to keep this value. This position if so desired is adjustable.
3. Slide the Hi/Lo slide switch to the Lo position and dial it to the range desire then press and hold the EZ-Dial™ Knob
until STORED appears to store the value.
Memory will be maintained even when power is off.
To start stepping after you have selected the step size and step time as described below scroll
back up the configuration mode to STORE/STEP and select step then let the unit time out of
configuration mode. Place the slide switch in either Hi or Lo position and press and hold the
EZ-Dial™ Knob to start and also to stop.
Step Size
To change the step size, press the EZ-Dial™ Knob to find the desired step size or %.
Step Time
To change the step time, press the EZ-Dial™ Knob to find the desired step time indicated in seconds. This is the time in-between
each step.
Display Resolution
To Select between High resolution 0.01º, 000.000Ω or Low resolution 0.1º, 000.00Ω, press the EZ-Dial™ Knob to find the desired
display setting.
Double-click the EZ-Dial™ Knob to return to the configuration menu at any time of operation.
Read Mode
Slide the SIMULATE/OFF/READ switch to READ for direct RTD or T/C input. Then slide the EZ-Check™ Switch to DIAL position to
monitor the RTD or T/C input. The Model 525 displays temperature corresponding to resistance input for the selected RTD type.
Memory is updated every second once the unit is turned on or the CLEAR option is used. This helps when looking at temperature drift
or for any other deviation. Slide the EZ-Check™ Switch to HI and LO to recall maximum and minimum saved readings. Observe the
“HI” and “LO” switch position indicators in the display. Press and hold the EZ-Dial™ Knob to clear saved readings. The display flashes
“CLEARED” as a confirmation.
Be sure the switch is in the DIAL position to monitor input.
Turning the EZ-Dial™ Knob has no effect in read mode.
RTD READ ONLY-Automatic 2, 3, or 4 wire detect: Connect 2, 3, or 4 wires to the RTD sensor. Follow the connection diagrams.
The Model 525 indicates “2W”, “3W”, or “4W” in the lower left corner of the display. It will also place an arrow under each connected
wire to show which wire is connected and will indicate if there is an “ERROR”. Use this feature for troubleshooting unconnected leads
or sensors. See below figure.
RTD Read Connection, (wire kit supplied)
RTD Read Mode Connection
Display Indications:
Check Connections 1 and 2 You have to have wires 1
and 2 connected correctly
before trying to connect up
to a 3 or 4 wire transmitter
OVERRANGE or
UNDERRANGE
The resistance input exceeds
the range of the selected
RTD type.
OPEN RTD No RTD is connected.
MISCONNECT The Model 525 is incorrectly
connected for a 3-wire or 4-
wire reading. Both black
leads are required.