Crystal 2100 Series - Manual (Page 6)

PN: 2102
8/01
Page 6 of 8
If you have any questions regarding calibration or repair, please contact us at any of the phone
numbers listed on the back of the manual.
Pressure Indicator Calibration Procedure
Use this procedure to calibrate the 2100 Pressure indicator.
1. Verify the condition of the battery. Make sure that the L0BAT indicator is not on, or check
battery voltage. Battery voltage must be greater than 7V. Replace the battery if neces-
sary.
2. Connect the instrument to the pressure calibration system. Be sure that the pressure
calibration system and the connection to the instrument being calibrated is leak free.
3. Allow the instrument to stabilize at room temperature, away from drafts, for at least 30
minutes before proceeding with calibration.
4. Set the scale to 200
″H
2
O range (or the most sensitive range [selector switch set fully
counter-clockwise]).
5. The front panel ZERO potentiometer should be centered. To center the front panel ZERO
rotate the front panel ZERO potentiometer fully clockwise until a click is heard, or there is
no more increase in output. Then rotate the front panel ZERO pot counter-clockwise 15
turns.
Calibration Procedure
A calibration cycle of 1 year is recommended to maintain the 2100 within specifications. Severe
operating conditions (extreme temperature changes, vibration, etc.) may require a more frequent
calibration cycle.
These procedures assume that you are familiar with proper calibration techniques especially
with regard to high vacuum measurements. (Specifically, a leak free system is required so that
pressure differentials do not occur between the instrument being calibrated and the pressure
standard.) Recommended equipment is listed in Table 1.
Instrument Minimum Specification Recommended Model
Pressure Standard 0.025% of scale Pressurements deadweight
gauge, Model T2300
Precision Current Source 0.005% of reading +1µA EDC Model 521
Absolute Only:
Vacuum Gauge ±1milliTorr @10 milliTorr Hastings VT6S2
Absolute Gauge 0.01% of Scale Ruska PPG-30
Vacuum Pump capable of 1 milliTorr
dead-end vacuum
Table 1: Required Equipment