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35040
Operators Manual
1-6
0.10%0.10%]
5
Period
[ Error Charge Observed +×≤
and
0.15%0.10%]
5
Period
[ Error Current Observed +×≤
where “Period” is the time interval in years between calibrations.
Gain Temperature Stability: The maximum temperature effect is less than ± 0.05%rdg for both charge
and current measurements over operating range of 18°C to 28°C. Add an additional ± 0.05%rdg for
operation during and immediately following battery charging at the high rate. Add an additional ±
0.01%rdg/°C for operation over the ranges of (8°C to 18°C) and (28°C to 38°C).
AC Line Gain Stability: The maximum AC line voltage effect is less than ± 0.02%rdg over the full
operating range of 100 to 240 VAC (47 - 63 Hz).
Maximum Input Current: To achieve the stated measurement accuracy, the instantaneous input current
must be limited to less than ± 100 nA.
Input Protection: The electrometer input is protected by a 100 kW ± 10% series resistor. The maximum
input current level of 3 mA should never be exceeded. Currents above this level may damage the
instrument.
Exposure Threshold: The start and end exposure thresholds are adjustable from the front panel over the
range of 0.0 to 9.9 pA in 0.1 pA steps. Setting the start exposure threshold to 0.0 pA disables the
automatic exposure detection system and turns off both the automatic reset and current leakage
compensation features. When the start exposure threshold is set above 0.0 pA, the leakage
compensation feature operates by automatically subtracting the leakage current value from the measured
current throughout the duration of the exposure. Both the displayed current and charge values are thus
compensated for leakage current effects. The leakage current value used in this compensation is derived
by averaging the current over the 10 s period immediately prior to the start of the exposure.
Current Leakage: Dosimeter input leakage is warranted to be less than 10 fA over both the full operating
temperature range of 8°C to 38°C and for humidities up to 80% R.H., but only for conditions in which the
absolute humidity is £ 20 g/m
3
(the equivalent R.H. is 75% at 25°C, 60% at 30°C, and 50% at 35°C).
Stabilization Time: The instrument is warranted to meet its measurement accuracy and current leakage
specifications within 2 minutes of power up. A maximum of 2 minutes may be required for the leakage
current to stabilize to below the 10 fA level following a change to the ion chamber bias voltage selection
(exclusive of ion chamber and cable effects). The instrument is warranted to meet its measurement
accuracy specifications within 1 hour of power up.
Input Connectors: Two female triaxial type mounted on front and rear panels and connected in parallel.
High Performance Power Supply and Battery Charger
AC Line Input Voltage Range: 100 to 240 VAC (47 - 63 Hz) without operator switching.
AC Line Input Receptacle: IEC 320/C13 style with integral fuse holder located on the rear panel.
AC Line Protection Fuse: 5 x 20 mm IEC type F1H250V fuses are used.
Battery Type and Capacity: Lead acid battery provides 8 hours of continuous operation.
Recharge Time: Fast recharge time less than 3 hours to the full charge level, even during operation.
Low Battery Annunciator: “LoBat” is displayed when the battery voltage drops below 5.9 V. To protect
the battery from deep discharge, the unit automatically powers down when the battery voltage drops
below the level of 5.4 V. The instrument will operate for approximately 30 minutes with the “LoBat”
annunciator displayed before automatically powering down.
Automatic Power Down: The instrument may be customized by the user (via the supplied Customization
program) to automatically power down after a preset period of inactivity (lack of a key press, RS-232