Welch Allyn Micro Tymp 2, Руководство по обслуживанию

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Preliminary Bench Test for MicroTymp 2 23641 continued:
Test 5 Inactive Current Drain
5.1 — Keep battery in partially installed position as in step 4.2 above.
5.2 — Connect Milliammeter ( - ) Negative lead to positive spring contact in the battery
compartment as per FIG 5.2
5.3 — Connect Milliammeter (+) Positive lead to positive side of battery . FIG 5.2
5.4 — Observe current drain. Current will be less than 1 milliamp, typically 500-600
microamps. Note: One possible cause of failure is shorted capacitor C11.
5.5 — Leave all connections as they are for the next test.
Test 6 Active Current Drain
6.1 — Depress and hold black center push button to activate MT2.
6.2 — Observe current drain while the black button is depressed. Current can rise up
to as much as 350 mA +/- 50 mA , then fall to 175 mA +/- 25 mA..
6.3 — Release black button. Current will fall to 135 mA +/- 25 mA.
6.4 — If readings are normal, calibrate with Calvin equipment.
4
Figure 5.2 Current Drain
Probe end
Valve
+ Milliamps –
battery
+ –
+
Inactive current drain 500 600 microamps
Button IN Active current drain 175 +/- 25 mA
Button OUT Active Current drain 135 +/- 25mA