| Specifications |
| Charged Plate |
| |
Isolation: |
Self-discharge
<10% in 5 minutes with 40% relative humidity
and ambient ionization levels <200 ions/cc |
| |
Capacitance: |
20
pf ± 2 pf. No circuitry is attached to
the plate, resulting in zero stray capacitance. |
| |
Charging: |
Internal
power supplies for each polarity, current limited
by 1 Gw resistor |
| |
Voltage
Measurement: |
Non-contacting
electrostatic field meter |
| |
Dimensions: |
6" x 6" (15.2 x 15.2
cm), isolated by Teflon® insulators |
| Plate Voltage Function |
| |
Controls: |
TRACK monitors actual plate voltage;
+PEAK/-PEAK monitors peak plate voltage; OFFSET
monitors long-term average balance. |
| |
Display: |
4.5
digits, 0.4" (1 cm) digit height, least significant
digit indicates 1 V |
| |
Accuracy: |
± 2% chopper stabilization
(accuracy unaffected by air ionization) |
| Plate
Charging Function |
| |
Controls: |
LEVEL
switch selects either 1 or 5 kV charging voltage;ZERO
switch grounds the isolated plate; ZERO SET used
with the ZERO switch sets the plate voltage to
zero; two CHARGE switches connect the positive
and negative internal charging source to the isolated
plate. |
| Balance
Meter Function |
| |
Controls: |
Full-scale
level can be set to 50, 100, or 250 V for each
polarity. |
| |
Display: |
10-segment
LED bar graph for each polarity, separate LED
indicates over-range. |
| Discharge
Timer Function |
| |
Controls: |
STOP
LEVEL can be set to 50, 100, or 500 V for both
polarities. TIMER RESET sets timer to zero. |
| |
Display: |
5.5
digits, 0.4" (1 cm) digit height, least significant
digit indicates 0.1 seconds. |
| |
Accuracy: |
Crystal
controlled |
|
Charged Plate Monitor
- Accurately tests and calibrates any type of ionization
equipment
- Features user-selected charging levels (1 or 5 kV) and
stop levels (50, 100 or 500 V), allowing you to test ionizer
discharge time at a variety of settings
- Displays floating offset voltage, peak voltage swing,
and long-term average balance
- Displays high and low ion levels or lets you view ionizer
balance in real-time
- Unique LED bar graph provides easy visualization of positive
and negative voltage swings
- Analog output signals to a chart recorder or other device
for hard copy documentation
This Charged Plate Monitor (CPM) is an easy-to-use, self-contained
instrument for testing ionizer performance.
Unique Charging Method Ensures High Accuracy
It ensures high accuracy through a unique method of charging
the isolated plate. It utilizes a top-mounted, stainless steel
plate monitored by an internal electrostatic field meter.
The plate is charged by a solenoid-actuated contact, then
isolated from the rest of the instrument during the measurement
process.
This method eliminates the need for an internal high-voltage
relay as well as the inaccuracies caused by poor isolation
and stray capacitance. Using this method without ionization,
a charge of 1,000 volts decays to 100 volts in 12 to 14 hours—the
lowest rate of charge leakage on any CPM available. The monitor’s
chopper-stabilized circuitry optimizes the accuracy in ionized
environments.
To measure long-term average balance, the voltage plate is
set to zero and allowed to float. The voltage then swings
positive and negative as the electrostatic field fluctuates
and ions arrive at the plate.
The CPM’s peak voltage mode records and displays peak
voltage swing levels, while an LED bar display clearly indicates
the swing of pulsing ionization systems. To measure discharge
time, the plate can be charged to 1,000 or 5,000 volts of
either polarity, set to one of several stop times, and timed
with an internal timer.
The CPM makes all measurements described in Ionization Standard
ANSI EOS/ESD S3.1-1991 of the ESD Association.
| Charged
Plate Monitor |
|
|
Cat.
# |
$/Each |
| 120
VAC, 50/60 Hz |
2005-14 |
Login |
| 230
VAC, 50 Hz |
2005-14-220 |
Login |
|
