Measuring Instrument for Transmission Characteristics

MS-302

This is a measuring instrument for evaluating the overall transmission characteristics of a variety of carrier telephone equipment and communication devices (successor of the MS-301 measuring instrument for transmission characteristics).

Equipment Category

Measuring instruments for transmission characteristics

Power supply

100V AC

Compatible with 75 Ω, 150 Ω and 600 Ω systems.

It supports the measurement band from 100 Hz to 5 MHz.

Its level meter has a built-in psophometric noise meter (compliant with ITU-T O.41), 800 Hz band-pass filter, and 10 kHz low-pass filter, which can be switched for use with one-touch control.

The level meter is an analog type and allows users to check instantaneous interruption and signal level fluctuations.

It is also equipped with an indicator scale magnification function (EXPAND).

MS-302 is portable and can be battery operated.

(The battery is optional)

Configuration example

Main Specifications

Item

Specifications

Oscillator

Output types

Types	Terminal	Impedance	Oscillation frequency range
75 Ω (balanced)	I-214APS and M1PS	75Ω±5%	4kHz～650kHz
150 Ω (balanced)		150Ω±5%	4kHz～650kHz
600 Ω (balanced)		600Ω±5%	200Hz～150kHz
75 Ω (unbalanced)	BNC	75Ω±5%	100Hz～5MHz

Output frequency setting range

100 Hz to 1 MHz: 1-Hz step; 1 MHz to 5 MHz: 10-Hz step

Output frequency accuracy

Within ±5×10^-5

Output relative harmonic content

-30 dB or lower (including both second- and third-order harmonics)

Output level setting range

-45dBm～+15dBm

Output level switching

5 dB × 10 steps，1 dB × 10 steps, * Key with a fine control switch

Output level accuracy

	100Hz～<1MHz	1MHz～5MHz
-30dBm～ +15dBm	±0.2dB	±0.3dB
-45dBm～<-30dBm	±1.0dB	±3.0dB

Level meter

Input types

Types	Terminal	Impedance	Measurement frequency range
75 Ω (balanced)	I-214APS and M1PS	75Ω±5%/HIGH	4kHz～650kHz
150 Ω (balanced)		150Ω±5%/HIGH	4kHz～650kHz
600 Ω (balanced)		600Ω±5%/HIGH	200Hz～150kHz
75 Ω (unbalanced)	BNC	75Ω±5%/HIGH	100Hz～5MHz

* HIGH: 50 kΩ or higher for 75 Ω (balanced)/150 Ω(balanced)/600Ω (balanced) input; 10 kΩ or higher for 75 Ω (unbalanced) input

Level measurement range

Meter indication

-70dBm～+32dBm

Range switching

30 dB × 1 step，5 dB × 10 steps, 1 dB × 10 steps

Step error

30-dB step: within ±0.5 dB;　5-dB step: within ±0.2 dB;　1-dB step: within ±0.2 dB

Level measurement accuracy

	100Hz～<1MHz	1MHz～5MHz
+30dBm～+32dBm	Within ±1.0 dB	Within ±1.0 dB
-30dBm～<+30dBm	Within ±0.2 dB	Within ±0.3 dB
-60dBm～<-30dBm	Within ±0.3 dB	Within ±0.5 dB
-70dBm～<-60dBm	Within ±1.5 dB	Within ±1.5 dB

Meter scale indication magnification (EXPAND)

Magnifies the range of 0 dBm±0.1 dB (minimum scale: 0.05 dB).

Test filters

Types	Pass band	Stop band attenuation	Level measurement range *	Insertion error
LPF: Low-pass filter	200Hz～10kHz	40 dB or higher at 30 kHz	-70dBm～+31dBm	Within ±0.5 dB
BPF: Band pass filter	800Hz±5Hz	45 dB or higher at 800 Hz + 800 Hz/-400 Hz	-81dBm～+16dBm	Within ±0.5 dB

Types	Filter characteristics	Measurement band	Level measurement range *	Insertion error
EQL: Psophometric noise meter	ITU-T O.41	200Hz～5kHz	-81dBm～+16dBm	Within ±0.5 dB

*: Meter scale included

Attenuator (Variable-resistance attenuator)

Input and output types

Types	Terminal	Impedance	Frequency band
600 Ω (balanced)	I-214APS and M1PS	Within 600 Ω±10 Ω	DC～150kHz
75 Ω (unbalanced)	BNC	Within 75 Ω±1 Ω	DC～5MHz

Maximum input level

+20dBm

Attenuation

Maximum attenuation

61dB

Range switching

10 dB × 5 steps, 1 dB × 10 steps, 0.1 dB × 10 steps

Step error

10-dB step

Within ±0.5 dB

1-dB step

Within ±0.2 dB

0.1-dB step

Within ±0.05 dB

Frequency deviation

Within ±0.3 dB at DC to <1 MHz; within ±0.5 dB at 1 MHz to <3 MHz; within ±2.0 dB at 3 MHz to 5 MHz

Use environment

Temperature range: 0°C to 40°C; Humidity range: 20% to 80% (Note: in an environment with no condensation)

Dimensions/mass

Dimensions: W370 mm × H270 mm × D110 mm, Mass: 7 kg or less (main unit only)