For example: Agilent E4440A or Anritsu 68369
Stanford Research Systems
Stanford Research Systems CG635
Stanford Research CG635 Synthesized Clock Generator, 2.05 GHz

Category: Function Generators
Stanford Research Systems DG535
Stanford Research DG535 4 Channel Digital Delay/Pulse Generator

Category: Pulse Generators
Stanford Research Systems DG645
Digital delay / pulse generator (4 or 8 ch.)

Category: Pulse/Data Generators
Stanford Research Systems DS335
1 mHz to 3.1 MHz, Function Generator

Category: Function/Arbitrary Waveform Generators
Stanford Research Systems DS360
200 kHz Ultra Low Distortion Function Generator

Category: Function/Arbitrary Waveform Generators
Stanford Research Systems FS700
10 MHz LORAN-C Frequency Standard

Category: Frequency Time Standards
Stanford Research Systems PS310
DC Power Supply, 1250 V, 0.02 A, 25 W, Programmable

Category: DC Power Supplies
Stanford Research Systems PS325
DC Power Supply, 2500 V, 0.01 A, 25 W, Programmable

Category: DC Power Supplies
Stanford Research Systems PS350
DC Power Supply, 5000 V, 0.005 A, 25 W, Programmable

Category: DC Power Supplies
Stanford Research Systems SR250
SR250 Boxcar Gated Integrator Module

Category: Plug In / Part / Component / Module
Stanford Research Systems SR560
Stanford Research System SR560 Low Noise Preamp IN

Category: Lock-In Amplifier
Stanford Research Systems SR620
Stanford SRS SR620 Universal Time Interval Frequency Measurement Counter

Category: Counters
Stanford Research Systems SR630
Model SR630 16 Channel Thermocouple Reader

Category: Data Acquisition Systems
Stanford Research Systems SR715
LCR Meter, 0.20% Basic Accuracy (10 kHz) w/ RS232

Category: LCR / Impedance Meters
Stanford Research Systems SR720
LCR Meter, 0.05% Basic Accuracy (100 kHz) w/ RS232

Category: LCR / Impedance Meters
Stanford Research Systems SR760
100kHz FFT Network/Spectrum Analyzer w/ Source

Category: Spectrum Analyzers
Stanford Research Systems SR770
100kHz FFT Network/Spectrum Analyzer w/ Source

Category: Network Analyzers
Stanford Research Systems SR780
Dual Ch, 102.4 kHz FFT Network/Spectrum Analyzer

Category: Network Analyzers