Iso-Tech IDM 91E Instruction Manual page 14

(6) Diode Check
Range
* Overload Protection: 500V d.c/a.c max.
Instant Continuity Description:
Internal sounder operates when resistance is less than 50
(7) Auto Power Off:
The meter will automatically shut itself off after approximately 30 minutes when the rotary switch is not changed.
The meter can be turned back on by switching to another range.
(8) Sounder Guard
The sounder will operate if the test lead is connected to the mA/µA (10A) input terminal while the rotary function
selector is not in mA/µA (10A) position. There is no sounder guard on the 20mA/10A range of DC and AC function.
Resolution
1mV ±(1.5%reading + 5digit)
Accuracy
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14
Max.Test
1.5mA
Max.Open
3.2V