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3. Instructions for technical safety checks
These tests may be performed by qualified staff only and in accordance with the following test
instructions (Section 6, para. 4 MPBetreibV). An equipment logbook of the technical safety checks
must be kept (see appendix) and filed for the next safety inspection (Section 6, para. 3 MPBetreibV).
The following measuring and testing equipment is required:
Oscilloscope (storage oscillograph) for checking the output signal
Settings: -
Time base = 20 µs/div (500 ms/div) for stimulation frequency measurement
- Resolution = 500 mV, 1 V, 2 V, 10 V/div (full screen)
- Mode = High resolution is recommended for maximum accuracy (HiRes) or
sample
- Trigger = falling slope, e.g. 30 %
Ohmmeter for checking test resistance
Test resistor 10 kΩ +/- 1%
9 V battery alkaline, battery voltage > 7 V (a fresh battery is recommended).
3.1 Visual inspection of Stimuplex® HNS 12 and accessories
See Section 2.1. – Enter results in equipment logbook.
3.2 Functional check of Stimuplex® HNS 12
See Section 2.2. – Enter results in equipment logbook.
3.3 Checking the operating controls and monitoring equipment
• Check instant set keys (keypad)
mA key: Press the mA key repeatedly. In the display, the value is highlighted by a border for approx.
3 seconds. Only a value highlighted by a border can be changed by repeatedly pressing the key.
Adjustable current range settings are 1.00 mA or 5.00 mA.
ms key: Press the ms key repeatedly. In the display, the value is highlighted by a border for approx.
3 seconds (see above). Adjustable settings are 0.10 ms, 0.30 ms, 1.00 ms stimulus duration (0.05 ms
and 0.50 ms, if applicable).
Hz key: Press Hz key repeatedly. In the display, the value is highlighted by a border for approx. 3
seconds (see above).
Adjustable stimulation frequency settings are 1 Hz or 2 Hz.
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