MAT800 High speed programmable attenuator Windows95 / 98 / Me / 2000 / XP correspondence GP-IB

MAT800 High-speed programmable attenuator

Windows95 / 98 / Me / 2000 / XP correspondence GP-IB, RS-232C and software for making attenuation program are standard accessories.

Optimum for evaluation of communication quality of such wireless communication equipments as W-CDMA, CDMA, GSM, PDC, PHS, ETC, wireless LAN and Bluetooth.

MAT800 is a multi-functional and all-out programmable attenuator that is capable of controlling the attenuation of microwave signal at an ultra-high speed.

Features

1. The arbitrary attenuation programs is possible

128kwords built-in program memory

Maximum 2µs switching (readout) speed

Three readout modes of FREE, BURST and GATE

Setup of hold off period by the number of clocks or by time

2. The software for making attenuation program is a standard accessory

3. GP-IB and RS-232C are equipped as standard accessories

4. Four models are prepared for every frequency band

model A : 1.5 to 4.5GHz

model B : 3.0 to 9.0GHz

model C : 4.5 to 13.5GHz

model D : 1.95 to 5.85GHz

5. The maximum attenuation is 80dB

6. The minimum step size of attenuation is 0.05dB

1. Attenuation mode	2. Attenuation
Select either manual setup or programmed setup. * Refer to "Setting of attenuation".	Set the attenuation. It is valid in the manual mode. 0 to 80 dB in 0.05 dB steps.
3. Filter	4. Readout clock
Select switching response time of attenuator. * Refer to "About a filter".	Set readout clock of program memory. External clock and manual clock are available.
5. Program length	6. Program hold off period
Set program memory length. 8 to 131,072 words in one word step.	Set hold off period of program memory, that is, the time till the next readout is started. Perform setup by number of readout clocks or by time. * Refer to "Setting of attenuation".
7. Readout mode	8. Setup
Set readout method of program memory from Free, Burst and Gate. * Refer to "Program readout mode".	Set parameters of RS-232C or GP-IB.
9. External readout clock	10. Trigger input
Connector for input of external clock for reading program memory.	Connector for input of trigger signal for such read mode as Burst or Gate. * Refer to "Program readout mode".
11. SYNC output	12. Attenuator input / output
A signal synchronized with the top address of the program memory is output. * Refer to "Program readout mode".	SMA connector for attenuator input / output.

Setting of attenuation

Two methods are available for setup of attenuation ; manual or program. Select one by "ATTEN MODE".

Manual mode
Set the attenuation using the rotary encoder on the front panel. Alternatively, perform setup from outside using RS-232C or GP-IB. The setup parameters in manual mode are attenuation and filter only.

	M	A	N	U	A	L						2	3	.	4	5	d	B
															3	0	µ	s

Program mode
Read the memory storing attenuation data transferred from the computer. There are five parameters in the program mode ; readout clock, program length, hold-off period, readout mode and filter.

P	R	G	M			1	0	k	H	z		L	:	1	3	1	0	7	2
P	:	6	.	5	5	3	5	s			F	R	E	E		3	0	µ	s

The program readout period is the period from address 0 of the memory to address n (set by program length). The program length can be set between 8 and 131072 words in one word step. When the program is read up to address n, the attenuation data at address n is held for the hold off period (set by number of readout clocks or by time), and on termination of hold off period, the memory is read out from address 0 again.

About a filter
CR filter is inserted in the attenuation controlling line. Use when it is required to smooth the change at the moment of switching attenuation. However, it is necessary to pay attention to the relation with the readout clock. An appropriate filter value is normally 1 / 2 to 1 / 8 of the clock period.

　

The method of a program

When it is necessary to use the program mode, input the program (waveform) on a Windows computer using "Software for making attenuation program", which is provided as a standard accessory. Then transfer this attenuation data to the memory of MAT800 using RS-232C or GP-IB. Readout clock, program length, hold off period, readout mode and filter are set from the computer. Of course it is possible to set by keys on the front panel. Connect external clock and trigger signal as required.

Waveform creation

1. Standard waveforms input

The nine types of standard waveforms are prepared. They are sine wave, triangle wave, square wave, ramp wave, sinX / X, (1-ε^-ax), ε^-ax white noise and DC.

2. Straight line input

Two specified points are linked together by means of a straight line.

3. Arithmetic calculation input
A waveform is created by arithmetic calculation of addition, subtraction, clipping, absolute, mirror, smoothing, resize and offset.

4. One-point input
A waveform is created through input of one point at a time.

Waveform editing and file management
Waveform editing and file management may be performed using CUT, COPY, PASTE and UNDO.

Program readout mode

Three program available ; Free, Burst and Gate. Readout is executed regardless of the trigger signal in the Free mode. In the Burst mode, the readout of program memory is started at the rising edge of the trigger signal, the attenuation data of the terminating address is held until the next activation. Therefore, setup of the hold off period is not permitted in the Burst mode.
In the Gate mode, one set of the readout of program memory and hold off period is repeated while the trigger signal is of a high level. The last attenuation data is held when the trigger signal goes down to a low level and then address n of program memory is read out.

Application - wireless communication by changing transmission power

readout modes are quality test

With wireless communication equipments, W-CDMA, CDMA, GSM, PDC, PHS, ETC, wireless LAN and Bluetooth, the transmission power changes due to obstacles and multi-paths besides theoretical space losses, when the radio wave is transmitted through the space. This changing pattern can be simulated using MAT800 and the communication quality can be evaluated. This changing pattern can be easily created using "Software for making attenuation program". It will be very convenient if our "Shielding box ME8661" is used for this test. height="314">

Specification

	model A	model B	model C	model D
Frequency range	1.5 to 4.5GHz	3.0 to 9.0 GHz	4.5 to 13.5GHz	1.95 to 5.85GHz
VSWR	< 1.5 @ 2 to 4GHz < 2.0 @ 1.5 to 4.5GHz	< 1.7 @ 4 to 8GHz < 2.2 @ 3 to 9GHz	< 1.8 @ 6 to 12GHz < 2.2 @ 4.5 to 13.5GHz	< 1.6 @ 2.6 to 5.2GHz < 2.1 @ 1.95 to 5.85GHz
Insertion loss (0dB setting)	< 2.3dB @ 2 to 4GHz < 2.6dB @ 1.5 to 4.5GHz	< 3.0dB @ 4 to 8GHz < 3.3dB @ 3 to 9GHz	< 3.5dB @ 6 to 12GHz < 3.8dB @ 4.5 to 13.5GHz	< 2.6dB @ 2.6 to 5.2GHz < 2.9dB @ 1.95 to 5.85GHz

Attenuator
Setting range	0 to 80dB
Setting resolution	less than 0.05dB
Accuracy	less than ±0.5dB @ 0 to 10dB
(at center of frequency range and +10dBm input)	less than ±0.8dB @ >10 to 30dB
	less than ±1.0dB @ >30 to 50dB
	less than ±1.5dB @ >50 to 64dB
	less than ±2.0dB @ >64 to 74dB
	less than ±3.0dB @ >74 to 80dB
Impedance	50ohm nominal
Filter	1µs to 3ms, 1-3 step
Maximum input level	100mW @ CW or peak power
Input damage level	0.8W @ average power
	20W @ peak power of 1µs pulse
Input / output connector	SMA
Readout clock input
Input level	TTL level
Maximum frequency	500kHz
Input impedance	10kohm ±5%
Minimum pulse width	more than 200ns (both of high and low)
Input damage level	±20V (DC + ACpeak) max
Connector	BNC
Trigger input
Input level	TTL level
Input impedance	10kohm ±5%
Minimum pulse width	more than 1µs
Input damage level	±20V (DC + ACpeak) max
Connector	BNC
SYNC output
Output level	TTL level
Rise / Fall time	less than 100ns
Output impedance	approx. 100ohm
Connector	BNC

Functions
Attenuation mode	Manual and Program
Program mode
Program length	8 to 131072words, (available for setting in one word step)
Readout clock
Internal clock	100Hz to 500kHz, 1-2-5 step
External clock	DC to 500kHz
Manual clock	Due to pressing ENTER key
Hold off period
Clock setting	0 to 65535 clocks of readout clock (available for each clock)
	0 to 6.5535sec (by 100µs step)
Time setting	Free, Burst, Gate
Read mode
Backup of program	Program data is automatically saved when turning off.

Software for making attenuation program
Effective OS	Windows95 / 98 / / Me /2000 / XP
Making waveform
Standard waveform
Waveform type	Sine, Triangle, Square, Ramp, sinX / X, (1-ε^-ax), ε^-ax, White noise and DC
Parameter	Data size, Attenuation (except DC), Offset,
	Cycle (except White noise and DC), Phase (°)
	(except White noise and DC), Duty ratio (%)
	(only Square wave), Zero cross (only sinX / X),
	Attenuation ratio ( (1-ε^-ax) and ε^-ax)
Straight line	Link two points with line
Calculation	+, -, ×, Clipping, Absolute, Mirror, Smoothing, Resize, Offset
One point input	Input each point
Editing of waveform	Cut, Copy, Paste, Undo, Delete
File	New, Open, Close, Save, Save as, Data import, Data export, Print, Printer setup, Transmit, Exit

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