General; Controls And Indicators - Lakeshore 818 User Manual

3.1

GENERAL

This chapter covers Controls and Indicators (Paragraph 3.2), Voltage or Temperature Display (Paragraph 3.3),
Standard Curves (Paragraph 3.4), Alarm Operation (Paragraph 3.5), and Channel Selection for the Model 819
(Paragraph 3.6).
3.2

CONTROLS AND INDICATORS

Note: The unit completes an internal update cycle of between ¼ and ½ second before responding to a front
panel key entry. A key pressed for less than ½ second may be ignored.
1. Active Channel Indicators
2. SCAN Indicator
3. CHANNEL Key
4. HI ALARM and LO ALARM Keys
Figure 3-1. Model 818 and 819 Cryopump Monitor Front Panels
1. Line Cord Receptacle with Fuse and ON/OFF Switch
2. J1 Inputs: Input 1 (818); J1-1, J1-2, J1-3, J1-4 (819)
3. J3 Alarms: Channels 2, 3, and 4 LO and HI Outputs
4. I ADJ: Current Source Adjustment Potentiometer
5. J3 Alarms: Channel 1 LO and HI Outputs
6. CAL: Calibration Enable Button
7. 115/230 AC Voltage Selection Switch
Figure 3-2. Model 818 and 819 Cryopump Monitor Rear Panels
Operation
Lake Shore Model 818 / 819 Cryopump Monitor User's Manual
CHAPTER 3
OPERATION
5. Four-Digit Display
6. Units Indicators (V, K, °C, °F)
7. HI and LO Alarm Status Indicators (One for each channel)
8. Increment (s) and Decrement (t) Keys
8. J4 MONITORS Connector
9. 4-Position Configuration DIP Switch:
Switch 1 - Reserved (*)
Switch 2 - Alarm Latch
Switch 3 - Alarm Set
Switch 4 - Curve Set
10. J2 SERIAL I/O: Serial Interface
3-1