Time Electronics 1090 Portable Process Calibrator - Manual (Page 18)

18
1090 Technical Manual P a g e | 18
6.
1090 C alibration P rocedure
Calibration
MENU 6 ENTER, enters calibration mode
The unit prompts for a password to enter cal mode The code is 982053.
There are 8 calibration steps, as follows Pressing CLEAR at any step will skip that step, leaving
the calibration data for that step unchanged. Power must not be removed during the calibration
process, as this will cause the data check sum to be incorrect.
1) Input +30mV Apply +30.000mV to the input terminals. PRESS ENTER.
1) Input -30mV Apply -30.000mV to the input terminals. PRESS ENTER
2) Src +80.00mV Measure the output voltage. Use the up/down keys to adjust for an output
of 80.000mV output. For coarse the keys immediately below the arrow
keys can be used : 7/8 adjust down and up in 10 times larger units, 4/5,
100 times
When the unit is first calibrated after manufacture, the cal factor may be a
long way out. To avoid lots of key pressing, pressing SHIFT will set it to a
value close to the nominal calibration value.
3) Src +8.0mV As above, adjust for +8.000mV
4) Src - 80.0mV As above, adjust for -80.000mV
5) Src -8.0mV As above, adjust for -8.000mV
6) Temp Display current calibrated temperature. If incorrect, press ENTER and
enter the current temperature at the CJ sense point in degrees C.
7) Pt100 Only perform this task if the mA/pt100 board is fitted.
Connect a 300.0ohm precision resistor across the output terminals
Press ENTER.
the unit will then restart.