Typical RM4 Specifications

TRANSMITTER
Output voltage
Constant current ranges
Max. contact resistance   
Current variation with contact resistance

RECEIVER
Resistance ranges     

Resolution (ohms)     

Power supply sensitivity
Operating frequency 
Receiver input impedance 
Bandwidth   
Response time-Rural Filt.   
                      -Urban Filt. 
SP correction range
Analogue output   
Status Outputs (2 bits) 
   
GENERAL 
Power supply

Battery life 
Battery voltage range
Working temperature   
Weight (inc. batteries) 
Case dimensions     

CHARGER 
Output
Charging time
Input voltage to charger



40 V
1mA                (0.33mA - HCR mode *)
40 Kohm     (120 Kohm - HCR mode *)
< 0.6%, plus < 0.2 ohm +/- 1 digit



+/- 20 ohm  +/- 200 ohm  +/- 2000 ohm
(x3 in HCR mode *)
   0.01 ohm         0.1ohm               1ohm
(x0.33 in HCR mode *)
< 1% / V
137.5 Hz
100 Mohm in parallel with 1000 pF
13 Hz to 700 Hz, -3dB points
Approx. 1 second for 0.5 % accuracy
Approx. 2 seconds for 0.5 % accuracy
+ / - 2 V
+ / - 2 V fsd each range
Logic levels  1 = - 0.7 V wrt battery +ve
                     0 = - 4.7 V wrt battery +ve

8 AA Nickel Metal Hydride, rechargeable
2100 mAH batteries
62 hours
8 to 12 V
0 degrees C to + 50 degrees C
0.9 Kg
160 x 85 x 80 mm


70 mA at 25 V constant current
10 hours for 32 hour operation
240 V, 220 V, 120 V, 50/60 Hz
(specify UK, European, USA/Japan)

(* HCR mode = High Contact Resistance mode)

( All components and specifications subject to change without notice )

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