Timer: BM11D: 0 to 60 minutes
BM21: 0 to 90 minutes: User selects test duration
Hum Rejection: 1 mA rms per kV test voltage
2 mA rms maximum
Voltage range: BM11D: 50 to 1000 V a.c. or d.c.
BM21: 50 to1000 V a.c. or d.c.
(N.B. Display does not distinguish between V a.c. and V d.c.)
Accuracy (0 °C to +30 °C): ±2% ±1 V
Guard Terminal: Will guard out parallel resistances to a minimum of 250 kΩ.
When measuring 100 MΩ under these conditions, the additional error will be less
than 5%.
Capacitor charging time: 5s per µF to charge to 5 kV
Capacitor discharging time: 2s per µF to discharge to <50 V
Maximum continuous overload: 1 kV rms
Temperature coefficient: 0,2% per °C (test current >100 nA)
0,1% per °C for test voltage
Temperature range: Operating: -20 °C to +50 °C (Errors double outside range 0 to 30 °C)
Storage: -25 °C to +65 °C
Power supply: Two 12 V, 2 Ah Lead-acid rechargeable batteries. Recharge time: 16 hours
Battery life: typically 8 hours continuous testing
Environmental protection: IP54 (with the charging recess cover securely closed)
Altitude: 2000 m max. to operate within specification
Fuses: FS1: 100 mA (T), 250 V IEC 127/1
FS2: 100 mA (F), 250 V IEC 127/1
Mains Power cord fused plug (when applicable): 3 A fuse to BS 1362
Safety: The instruments meet the requirements for double insulation to IEC 1010-1 (1995) EN
61010-1 (1995) to installation Category III*, 300 Volts phase to earth (ground) and 500
Volts phase to phase
E.M.C: The instruments meet EN 50081-1 and EN 50082-1 (1992)
19
Specification
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