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Item Number:


Weight: 1 lbs (0.5 kg)
Length: 8.25 Inches (21 cm)
Width: 7.5 Inches (19 cm)
Height: 3.5 Inches (8.5 cm)

PDT-740B Static Decay Timer

Measure decay times for ionizers and materials

The PDT-740B Static Decay Timer is designed to measure the time required for a 1,000 volt charge to dissipate to less than 100, 50 or 10 volts in tenths of a second. This extremely useful accessory is used with the PROSTAT PFM-711A Field Meter and CPM-720A Charge Plate Monitor to evaluate Ionizer Decay Time in accordance with ESD Association Ionization Standard S3.1. The PDT-740B may be used to evaluate the static decay capabilities of materials, personnel, equipment and other products. It is compatible with most portable CPM's and field meters having an analog output (10,000 volts equals 1 volt). Completely automatic, the PDT-740B is simple to operate and easy to use.

OFF-ON Cut Off Voltage, 10, 50 and 100 Volts (Selects Voltage to stop timing)

Green LED:
Decay Cycle Ready > ± 1kV, CPM voltage > ± 1,000 volts

Red LED:
Timing in Progress, CPM voltage decay timing activated LOBAT displayed when battery voltage <6.0 volts

Liquid Crystal Display (LCD) displays elapsed decay time from ± 1,000 volts to selected Cut Off voltage in seconds and tenths of a second (00.0)

Automatically senses Positive & Negative voltage references

Zero & Reset:
Automatically Resets Timer and Display to 00.0 when CPM voltage > ± 1kV. Reset indicated when Green LED Decay Cycle Ready LED is ON.

Approximately 200 milliseconds in combination with CPM and PFM-711A

Timing Range:
From 0.2 to 159.9 seconds

Timing Setpoints:
Reset when voltage input 100mv ± 2mv (1,000 Field Meter Volts ± 20V)
Cut Off Voltage @ 100 V: 10mv ± 0.2mv (100 Field Meter Volts ± 2V)
Cut Off Voltage @ 50 V: 5mv ± 0.2mv (50 Field Meter Volts ± 2V)
Cut Off Voltage @ 10 V: 1mv ± 0.2mv (10 Field Meter Volts ± 2V)

Typically < ± 5%

One (1) standard 9-volt battery, PROCELL, Eveready #216 (NEDA 1604, JIS 006P, IEC 6F22)Eveready #216

Battery Life:
> 40 hours typical

Width: 2.75" (7 cm)
Depth: 1.0" (2.5 cm)
Length: 4.5" (11.4 cm)

Analog Cable
Length: 40" (102 cm)

6.5 oz. (184 gm)

Technical Documents:
» PDT-740B Data Sheet

PAR-809B Resistance
PDT-740B Static Decay Timer
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