ORTEC 935A

Quad constant-fraction discriminator

Four independently adjustable discriminators for fast timing, with common veto and individual channel gates for multidetector systems.

Independent channels
41
Input impedance
50 Ω1
Linear input range
−20 mV…−5 V1
Maximum input voltage
−10 V1
Datasheet

Specifications checked against the manufacturer’s documents on 2026-10-16

Manufacturer’s product page (opens in a new tab)

Overview

Key features

  • Four independent channels
  • Individual coincidence or anticoincidence
  • Channel activity indicators

Specifications

The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.

Performance

Pulse-pair resolution<4 ns1

Measuring range

Linear input range−20 mV…−5 V1
Threshold range−15…−1000 mV2

Electronics & signal

Independent channels41
Input impedance50 Ω1
Maximum input voltage−10 V1
Output pulse width2–500 ns1
Output amplitude−800 mV into 50 Ω load1

Environment & ratings

Operating temperature0–50 °C1

General

Constant fraction20% of maximum input pulse amplitude1

The data comes from the manufacturer’s published documents. Manufacturers may change specifications; the current configuration and performance are confirmed in the quotation.

Documents

Sources

The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.

  1. 1
    Publisher: ORTEC (AMETEK)Datasheet p. 1 Checked 2026-10-16
  2. 2
    Publisher: ORTEC (AMETEK)Product page product page Checked 2026-10-16
ORTEC 276L
ORTEC

ORTEC 276L

Low-power PMT base with preamplifier

PMT compatibility
10-stage, 14-pin; TRW 3B14 socket (JEDEC B14-38); directly compatible with many integrated NaI-PMT assemblies
Conversion gain
Nominally 5 µV/eV with a 2 × 2 in NaI(Tl) crystal and PMT gain of 10⁶
Weight
0.65 kg net
14 referenced values
ORTEC 269
ORTEC

ORTEC 269

PMT base for 14- and 12-stage, 20-pin photomultipliers

PMT compatibility
14- or 12-stage, 20-pin socket (JEDEC B20-102), including Hamamatsu R1250; Philips XP2020, XP2020Q, XP2040, XP2040Q, XP2041, XP2041Q, XP2212B, XP2230B, XP2233B, XP2262B; EMI 9813K
Weight
0.63 kg net
6 referenced values
ORTEC 266
ORTEC

ORTEC 266

PMT base for 10-stage, 14-pin photomultipliers

PMT compatibility
10-stage, 14-pin; TRW 3B14 socket (JEDEC B14-38)
Weight
0.37 kg net
6 referenced values
ORTEC 265A
ORTEC

ORTEC 265A

PMT base for 12-stage, 21-pin photomultipliers, for fast timing

PMT compatibility
12-stage, standard 21-pin sockets, including Hamamatsu R329, R1332, R1333 and Burle 8575, 8850, C31000M
Weight
0.63 kg net
6 referenced values
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