Linear and Rotary Encoders

Mercury 2000 Smart Encoder Systems
Rotary Encoder

Programmable Interpolation in Integer Steps to 0.078µm
Smallest sensor- 1/3 the size of other encoders
Revolutionary bolt-in alignment for many applications
Advanced SmartSignal electronics built into shielded D-sub connector
A-quad-B output with programmable interpolation in integer steps for resolutions to 0.078µm (linear); 4.2M CPR (rotary)
LED set up indicators for sensor alignment and index location
Bi-directional index signal is repeatable to encoder resolution

Specifications

Rotary - 20µm grating pitch

Rotary Glass Scale Diameter	Fundamental Resolution		Interpolation Below is a table of the available resolutions
0.472" [12.00mm]	1650 CPR		x4	x100	x256
		interpolated resolution (CPR)	6,600	165,000	422,400
		interpolated resolution (arc-sec/count)**	196.4	7.85	3.08
		interpolated resolution (µrad/count)*	952	38.0	14.86
		maximum speed* (RPM)	13090	10470	4090
0.750" [19.05mm]	2500 CPR		x4	x8	x20
		interpolated resolution (CPR)	10,000	250,000	640,000
		interpolated resolution (arc-sec/count)**	129.6	5.18	2.03
		interpolated resolution (µrad/count)**	628.3	25.1	9.8
		maximum speed* (RPM)	8640	6912	2700
1.250" [31.75mm]	4096 CPR		x4	x100	x256
		interpolated resolution (CPR)	16,384	409,600	1,048,576
		interpolated resolution (arc-sec/count)**	79.1	3.16	1.24
		interpolated resolution (µrad/count)**	383.5	15.3	6.0
		maximum speed (RPM)	5273	4219	1648
2.250" [57.15mm]	8192 CPR		x4	x100	x256
		interpolated resolution (CPR)	32,768	819,200	2,097,152
		interpolated resolution (arc-sec/count)**	39.6	1.58	0.618
		interpolated resolution (µrad/count)**	191.7	7.7	3.0
		maximum speed* (RPM)	2637	2109	824
4.250" [107.95mm]	16384 CPR		x4	x100	x256
		interpolated resolution (CPR)	65,536	1,638,400	4,194,304
		interpolated resolution (arc-sec/count)**	19.78	0.791	0.309
		interpolated resolution (µrad/count)**	95.9	3.83	1.5
		maximum speed (RPM)	1318	1054	412

*Maximum speed produces an encoder quadrature output of up to 28.8 million states per second.
** Resolution values shown are approximate. To calculate exact resolution valules, convert from CPR (Counts Per Revolution) to desired units.
Note: Specifications assume XOR function which is available in all standard controllers.

To calculate desired rotary interpolation multiplier, use the following equation

Interpolation Multiplier = Desired Resolution(CPR)/Fundamental Scale Resolution(CPR)

All Specifications are subject to change. All data is accurate to the best of our knowledge. MicroE Systems is not responsible for errors.

System

Grading Period	20µm
Signal Period	20µm
System Resolution	5µm - 0.078µm is an integer interpolation steps (factory set or user Programmed using MicroE SmartSignal Software)
Linear accuracy*
Interpolation accuracy:	Better than 0.12µm over any 20µm movement
Long-travel accuracy:	±1µm accuracy available - consult MicroE Better than ±3µm for scales up to 133mm Better than ±5µm for scales 155mm to 1m Better than ±5µm per meter for scales 1m or more
*Maximum peak to peak error over the specified movement when compared to a NIST-traceable laser interferometer standard, used at room temperature and with MicroE interpolation electronics.
Rotary Accuracy*	Scale O.D	Microradians**	Arc-Seconds**
	12.00mm	±100	±21
	19.05mm	±63	±13
	31.75mm	±38	±7.8
	57.15mm	±19	±3.9
	107.95mm	±10	±2.1
*Based on ideal scale mounting concentricity

Sensor Size

W:	12.70mm	0.500"
L:	20.57mm	0.810"
H:	8.38	0.330"

Operating and Electrical Specifications

Power Supply	±5VDC 5% @330mA (30mA for sensor)
Temperature
Operating:	0 to 70°C
Storage:	-20 to 70°C
Humidity:	10 -90% RH non-condensing pending
EMI:	CE Compliance pending
Shock:	1500G 0.5 ms half sine (Sensor)
Sensor Weight:	5.0g (Sensor without cable)
Cable:	Double Shield. Maximum length 2m. Diameter:3.6mm (0.142") Flex Life: 20 x 10 cycles @ 20mm bending radius

Part Numbering System

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