The Keithley Model 602 is a high quality, general purpose electrometer capable of measuring low currents, low voltage levels and high resistances. It is best known in the industry for its stability and extremely low input offset current on the order of less than 5 fA.

This electrometer is modified to make is expressly suited for medical dosimetry applications. The modifications include:
• Installation of a 150/300 volt electronic bias supply with   reversible polarity
• Replacement of the analog meter with a 4 1/2 digit LCD
• Installation of a single 12V rechargeable battery with wall-mount
• UL listed transformer/charger
• Installation of circuitry to allow bias voltage and battery condition to be read on the display
• Installation of a metal connector cap with retaining chain
• Color-coding of switch positions for ease of use
• Coulomb scale calibration to ±0.1% and complete QA at checkout

Specifications

Display: LCD, 4 1/2 digit, 0.48” high
Range: Charge: .0001x10-10 to 12.000x10-7C
Current: .0001x10-11 to 12.000x10-1A
Overrange: Indicated by 1 followed by blanks
Accuracy: ±0.1% of reading + 1 digit
Linearity: ±0.1% + 1 digit or precision of reading
Leakage:  <5x10-15A
Calibration: coulomb scale to ±0.1%
Input Impedance: >1x1014 ohm
Temp. Coefficient: 0.2%/EC
Bias: internal electronic bias supply; -150V, -300V, OFF, +300V, +150V, selectable on front panel, bias voltage may be read on  display
External Bias: Binding posts for banana plugs
Input: Triaxial BNC-F with cap & chain
Power: rechargeable 12V 1.2 AH gel-cell battery, voltage may be
read on display, low battery indicator, 120VAC UL listed wall- mount charger provided (240VAC optional)
Current Drain: 57mA
Dimensions: 7” Wide x 10.75” High x 11.5” Deep
Weight: 14.5 lbs